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bios.s@ 9519422

Last change on this file since 9519422 was 6dc5ea7, checked in by Thomas Lopatic <thomas@…>, 7 years ago
Linked RAM without errors.
Property mode set to `100644`
File size: 104.0 KB

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[4f508e6]	1	\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|
	2	\| \|
	3	\| bios.s -- BIOS for the Buchla 700 and NASA 3D Helmet Display \|
	4	\| ------ -------------------------------------------------- \|
	5	\| \|
	6	\| See VM1,VM2 and VDATE for version and date \|
	7	\| Written by D.N. Lynx Crowe \|
	8	\| \|
	9	\| Very loosely based on ideas from: \|
	10	\| \|
	11	\| "Atari ST Internals", by Abacus Software, \|
	12	\| "A Hitchhiker's Guide to the BIOS", by Atari, \|
	13	\| "DOS Technical Reference", by IBM, \|
	14	\| "DOS/360", by IBM,
	15	\| "CP/M" , by Digital Research, and, of course, \|
	16	\| "Unix (tm)", by AT&T, et al. \|
	17	\| \|
	18	\| After all, Why re-invent the wheel? \|
	19	\| \|
	20	\| Some of the functions are the same as Ataris, but quite a few are different, \|
	21	\| and our I/O configuration is much different, so BEWARE! Make no \|
	22	\| assumptions, and read the documentation and comments very carefully. \|
	23	\| \|
	24	\| Especially watch out for the extended BIOS functions. Most of them \|
	25	\| are nothing at all like the Atari / GEMDOS extended bios functions, \|
	26	\| and even the ones that are similar have different numbers. \|
	27	\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|
	28
[f40a309]	29	.text
[4f508e6]	30
	31	\| Version and date
	32	\| ----------------
	33	VM1 = 18 \| First part of version number
	34	VM2 = 0 \| Second part of version number
	35	VDATE = 0x19880620 \| Version date
	36
	37	BUCHLA = 1 \| Non-Zero for Buchla 700, 0 for NASA
	38	NASASIO = 0 \| Non-zero for NASA, 0 for Buchla addr.
	39
	40	FL_SKR = 0x00 \| Seek rate (WD1772, 6Ms/step)
	41	\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|
	42
	43	.page
	44
	45	.xref start_ \| Where ROMP starts
	46	.xref _errno \| Start of ROMP bss space
	47
	48	.xdef basepage \| Pseudo base page for romp
	49	.xdef _rsflag \| Register save area overflow flag
	50
[f40a309]	51	.ifne BUCHLA
[4f508e6]	52
	53	.xdef _hdvini \| Disk init
	54
[f40a309]	55	.endc
[4f508e6]	56
	57	.xdef _wzcrsh \| ROMP crash flag
	58	.xdef _crshvc \| Crash vector
	59	.xdef _crshsr \| Crash SR
	60	.xdef _crshpc \| Crash PC
	61	.xdef _crshsp \| Crash SP
	62	.xdef _crshus \| Crash USP
	63	.xdef _crshrg \| Crash SP registers
	64	.xdef _crshst \| Crash top of stack
	65
	66	.page
	67
[f40a309]	68	.ifne BUCHLA
[4f508e6]	69
[f40a309]	70	.xdef _hz_1k
	71	.xdef _hz_200
	72	.xdef frclock
	73	.xdef t1count
	74	.xdef t2count
	75	.xdef t3count
[4f508e6]	76
[f40a309]	77	.xdef nflops
	78	.xdef disknum
	79	.xdef booted
	80	.xdef seekrate
	81	.xdef flock
	82	.xdef fverify
[4f508e6]	83
[f40a309]	84	.xdef retrycnt
	85	.xdef wpstatus
	86	.xdef wplatch
	87	.xdef bootdev
[4f508e6]	88
[f40a309]	89	.xdef cdev
	90	.xdef ctrack
	91	.xdef csect
	92	.xdef cside
	93	.xdef ccount
[4f508e6]	94
[f40a309]	95	.xdef cdma
	96	.xdef edma
	97	.xdef tmpdma
	98	.xdef rseed
[4f508e6]	99
[f40a309]	100	.xdef savptr
[4f508e6]	101
[f40a309]	102	.xdef flpsrsv
	103	.xdef flpregs
[4f508e6]	104
[f40a309]	105	.xdef dsb0
	106	.xdef dsb1
[4f508e6]	107
[f40a309]	108	.xdef dskmode
	109	.xdef dskerrs
	110	.xdef drvbpbs
[4f508e6]	111
[f40a309]	112	.endc
[4f508e6]	113
[f40a309]	114	.xdef biostop
[4f508e6]	115
	116	.page
	117
	118	\| Some critical equates:
	119	\| ----------------------
	120	\| Interrupt masks
	121	\| ---------------
	122	IPL3 = 0x0300 \| IPL 3 value for sr
	123	IPL4 = 0x0400 \| IPL 4 value for sr
	124	IPL7 = 0x0700 \| IPL 7 value for sr (4 for debug)
	125
[f40a309]	126	.ifne BUCHLA
[4f508e6]	127
	128	INITIPL = IPL3+0x2000 \| Initial Internal Priority Level
	129
[f40a309]	130	.endc
[4f508e6]	131
[f40a309]	132	.ifeq BUCHLA
[4f508e6]	133
	134	INITIPL = IPL4+0x2000 \| Initial Internal Priority Level
	135
[f40a309]	136	.endc
[4f508e6]	137
	138	\| Memory allocation
	139	\| -----------------
[f40a309]	140	.ifeq BUCHLA
[4f508e6]	141
	142	TPA = 0x008000 \| Put TPA 32K up from the bottom
	143
[f40a309]	144	.endc
[4f508e6]	145
[f40a309]	146	.ifne BUCHLA
[4f508e6]	147
	148	TPA = 0x010000 \| Put TPA 64K up from the bottom
	149
[f40a309]	150	.endc
[4f508e6]	151
	152	SSTACK = TPA \| Put system stack just below TPA
	153
	154	p_bbase = 0x0018 \| Basepage offset to bss base
	155	p_blen = 0x001C \| Basepage offset to bss length
	156
	157	\| It's magic ...
	158	\| --------------
	159	FMAGIC = 0x87654321 \| Magic for formatting
	160	RETRYIT = 0x10000 \| Magic for re-try from criter
	161	RSMAGIC = 0x78563412 \| Magic for register save area OK
	162
	163	\| Miscellaneous constants
	164	\| -----------------------
	165	FCMAX = 0x00FFFFFF \| Maximum frame counter value (24 bits)
	166
	167	.page
	168
	169	\| CFR0 Baud Rates:
	170	\| ----------------
	171	BR_300 = 0x04
	172	BR_600 = 0x05
	173	BR_1200 = 0x06
	174	BR_1800 = 0x07
	175	BR_2400 = 0x08
	176	BR_3600 = 0x09
	177	BR_4800 = 0x0A
	178	BR_7200 = 0x0B
	179	BR_9600 = 0x0C
	180	BR_19K2 = 0x0D
	181	BR_EXT = 0x0F
	182
	183	\| CFR0 Stop bits (includes TBR select bit):
	184	\| -----------------------------------------
	185	NSB_1 = 0x40
	186	NSB_2 = 0x60
	187
	188	\| CFR1 Number of Data Bits (includes MSB):
	189	\| ----------------------------------------
	190	NDB_5 = 0x80
	191	NDB_6 = 0xA0
	192	NDB_7 = 0xC0
	193	NDB_8 = 0xE0
	194
	195	\| CFR1 Parity Selection:
	196	\| ----------------------
	197	P_ODD = 0x04
	198	P_EVEN = 0x0C
	199	P_MARK = 0x14
	200	P_SPACE = 0x1C
	201
	202	P_NONE = 0x00
	203
	204	\| Line Discipline:
	205	\| ----------------
	206	L_NUL = 0x00 \| No protocol
	207	L_XON = 0x01 \| XON/XOFF
	208	L_RTS = 0x02 \| RTS/CTS
	209
	210	.page
	211
	212	\| I/O Buffer Sizes:
	213	\| -----------------
	214	SR1IBS = 256
	215	SR1OBS = 256
	216	SR2IBS = 256
	217	SR2OBS = 256
	218
[f40a309]	219	.ifne BUCHLA
[4f508e6]	220
	221	MC1IBS = 512
	222	MC1OBS = 256
	223	MC2IBS = 512
	224	MC2OBS = 256
	225
[f40a309]	226	.endc
[4f508e6]	227
	228	\| Line Disciplines:
	229	\| -----------------
	230	SR1DISC = L_XON
	231	SR2DISC = L_XON
	232
[f40a309]	233	.ifne BUCHLA
[4f508e6]	234
	235	MC1DISC = L_NUL
	236	MC2DISC = L_NUL
	237
[f40a309]	238	.endc
[4f508e6]	239
	240	\| CFR Setings:
	241	\| ------------
	242	SR1CFR0 = BR_9600+NSB_1
	243	SR1CFR1 = NDB_8+P_NONE
	244	SR2CFR0 = BR_9600+NSB_1
	245	SR2CFR1 = NDB_8+P_NONE
	246
[f40a309]	247	.ifne BUCHLA
[4f508e6]	248
	249	MC1CFR0 = BR_EXT+NSB_1
	250	MC1CFR1 = NDB_8+P_NONE
	251	MC2CFR0 = BR_EXT+NSB_1
	252	MC2CFR1 = NDB_8+P_NONE
	253
[f40a309]	254	.endc
[4f508e6]	255
	256	.page
	257
	258	\| I/O Addresses:
	259	\| --------------
	260	VSDDINIT = 0x200400 \| VSDD initial register base address
	261	VSDDDATA = 0x200000 \| VSDD data segment base address
	262
[f40a309]	263	.ifeq BUCHLA
[4f508e6]	264
[f40a309]	265	.ifeq NASASIO
[4f508e6]	266
	267	SR1ACIA = 0x3A8001 \| Serial-1 ACIA base address (BUCHLA)
	268	SR2ACIA = 0x3A8009 \| Serial-2 ACIA base address
	269
[f40a309]	270	.endc
[4f508e6]	271
[f40a309]	272	.ifne NASASIO
[4f508e6]	273
	274	SR1ACIA = 0x398001 \| Serial-1 ACIA base address (NASA)
	275	SR2ACIA = 0x398009 \| Serial-2 ACIA base address
	276
[f40a309]	277	.endc
[4f508e6]	278
[f40a309]	279	.endc
[4f508e6]	280
[f40a309]	281	.ifne BUCHLA
[4f508e6]	282
	283	FPUBASE = 0x180000 \| FPU base address
	284	TIMER = 0x3A0001 \| Timer base address
	285	LCD = 0x3A4001 \| LCD driver base address
	286	SR1ACIA = 0x3A8001 \| Serial-1 ACIA base address (BUCHLA)
	287	SR2ACIA = 0x3A8009 \| Serial-2 ACIA base address
	288	MC1ACIA = 0x3AC001 \| MIDI-1 ACIA base address
	289	MC2ACIA = 0x3AC009 \| MIDI-2 ACIA base address
	290	FLOPPY = 0x3B0001 \| Floppy controller base address
	291	PSG = 0x3B4001 \| Sound chip base address
	292	LEDS = 0x3B8001 \| LED driver base address
	293	ANALOG = 0x3BC001 \| Analog processor base address
	294
	295	\| FPU address offsets and misc. values
	296
	297	FPU_CTL = 0x4000 \| FPU control
	298
	299	FPU_IN = 0x4000 \| FPU input address
	300	FPU_CLR = 0x6000 \| FPU interrupt reset address
	301
	302	FPU_RST = 0x0015 \| FPU reset value
	303
	304	\| PSG address offsets
	305
	306	PSG_RD = PSG \| Read PSG data
	307	PSG_WL = PSG \| Write PSG address latch
	308	PSG_WD = PSG+2 \| Write PSG data
	309
[f40a309]	310	.endc
[4f508e6]	311
	312	\| VSDD data structure offsets
	313
	314	VSDD_REG = VSDDDATA \| Registers
	315	VSDD_AT = VSDDDATA+0x0100 \| Access Table
	316
[f40a309]	317	.ifne BUCHLA
[4f508e6]	318
	319	\| Timer registers
	320
	321	TIME_CRX = TIMER \| Control register 1 or 3
	322	TIME_CR2 = TIMER+2 \| Control register 2
	323	TIME_T1H = TIMER+4 \| Timer 1 high byte
	324	TIME_T1L = TIMER+6 \| Timer 1 low byte
	325	TIME_T2H = TIMER+8 \| Tiemr 2 high byte
	326	TIME_T2L = TIMER+10 \| Timer 2 low byte
	327	TIME_T3H = TIMER+12 \| Timer 3 high byte
	328	TIME_T3L = TIMER+14 \| Timer 3 low byte
	329
[f40a309]	330	.endc
[4f508e6]	331
	332	\| ACIA Register offsets:
	333	\| ----------------------
	334	ACIA_IER = 0 \| ACIA IER offset
	335	ACIA_ISR = 0 \| ACIA ISR offset
	336	ACIA_CSR = 2 \| ACIA CSR offset
	337	ACIA_CFR = 2 \| ACIA CFR offset
	338	ACIA_TBR = 4 \| ACIA TBR offset
	339	ACIA_TDR = 6 \| ACIA TDR offset
	340	ACIA_RDR = 6 \| ACIA RDR offset
	341
	342	.page
	343
[f40a309]	344	.ifne BUCHLA
[4f508e6]	345
	346	\| Floppy register offsets:
	347	\| ------------------------
	348	DSKCMD = 0 \| Command / status
	349	DSKTRK = 2 \| Track
	350	DSKSEC = 4 \| Sector
	351	DSKDAT = 6 \| Data
	352
	353	\| Miscellaneous equates:
	354	\| ----------------------
	355	FL_NC = 0x02 \| Non-compensated R/W/F bit
	356
	357	APISIZE = 256 \| Analog processor buffer size
	358
	359	\| Floppy commands:
	360	\| ----------------
	361	FL_RS = 0x80 \| Read sector
	362	FL_RM = 0x90 \| Read multiple
	363	FL_WS = 0xA0 \| Write sector
	364	FL_WT = 0xF0 \| Write track (format)
	365	FL_FR = 0xD0 \| Force reset
	366	FL_SK = 0x10 \| Seek
	367	FL_SV = 0x14 \| Seek w/verify
	368
[f40a309]	369	.endc
[4f508e6]	370
	371	.page
	372
	373	\| iorec structure definitions:
	374	\| ----------------------------
	375	IORECLN = 40 \| Length of an iorec structure
	376
	377	ibuf = 0 \| Input buffer base address
	378	ibufsize = 4 \| Input buffer size (bytes)
	379	ibufhd = 6 \| Input buffer head index
	380	ibuftl = 8 \| Input buffer tail index
	381	ibuflow = 10 \| Input buffer low water mark
	382	ibufhi = 12 \| Input buffer high water mark
	383	obuf = 14 \| Output buffer base address
	384	obufsize = 18 \| Output buffer size (bytes)
	385	obufhd = 20 \| Output buffer head index
	386	obuftl = 22 \| Output buffer tail index
	387	obuflow = 24 \| Output buffer low water mark
	388	obufhi = 26 \| Output buffer high water mark
	389	cfr0 = 28 \| ACIA CFR, MS bit = 0
	390	cfr1 = 29 \| ACIA CFR, MS bit = 1
	391	flagxon = 30 \| XON flag (non-zero = XOFF sent)
	392	flagxoff = 31 \| XOFF flag (non-zero = active)
	393	linedisc = 32 \| Line discipline flags
	394	erbyte = 33 \| Last error byte
	395	isr = 34 \| ACIA ISR on interrupt
	396	csr = 35 \| ACIA CSR on interrupt
	397	errct = 36 \| Error count (FRM/OVR/BRK)
	398	ibfct = 38 \| Input buffer full count
	399
	400	.page
	401
	402	\| Error codes:
	403	\| ------------
	404	ERR01 = -1 \| All purpose error
	405	ERR02 = -2 \| Drive not ready
	406	ERR03 = -3 \| Unknown command
	407	ERR04 = -4 \| CRC Error
	408	ERR05 = -5 \| Invalid request
	409	ERR06 = -6 \| Seek error
	410	ERR07 = -7 \| Unknown media
	411	ERR08 = -8 \| Sector not found
	412	ERR09 = -9 \| End of media (out of paper)
	413	ERR10 = -10 \| Write fault
	414	ERR11 = -11 \| Read fault
	415	ERR12 = -12 \| General mishap
	416	ERR13 = -13 \| Write protected
	417	ERR14 = -14 \| Media changed
	418	ERR15 = -15 \| Unknown device
	419	ERR16 = -16 \| Bad sectors
	420	ERR17 = -17 \| Insert disk
	421
	422	.page
	423
	424	\| In the Beginning...
	425	\| -------------------
	426
	427	\| Low PROM -- Contains the initial sp (unused), and the initial pc,
	428	\| as well as some version and creation date stuff and a copyright message,
	429	\| just to be thorough about it.
	430
	431	begin: bra.s biosinit \| Jump to bios init
	432
	433	vermsg: dc.b VM1,VM2 \| Version number
	434
	435	dc.l biosinit \| Reset address (bios init)
	436
	437	created: dc.l VDATE \| Creation date
	438
[6dc5ea7]	439	copyrite: .ascii "{Copyright 1988 by " \| Copyright message
	440	.asciz "D.N. Lynx Crowe}"
[4f508e6]	441
	442	dc.l 0 \| Some padding
	443
[f40a309]	444	.page
	445	.even
[4f508e6]	446
	447	\| biosinit -- Setup the defaults for the BIOS
	448	\| -------- -------------------------------
	449	biosinit: move.w #0x2700,sr \| Set sup mode, no interrupts
	450	move.l #SSTACK,a7 \| Setup supervisor stack pointer
	451
	452	lea badtrap,a1 \| Set default trap vector
	453	adda.l #0x02000000,a1 \| ... with trap # in 31..24
	454	lea 8,a0 \| ... for traps 2..255
[f40a309]	455	move.l #253,d1
[4f508e6]	456
	457	binit1: move.l a1,(a0)+ \| Store trap vector
	458	adda.l #0x01000000,a1 \| Increment trap #
	459	dbf d1,binit1 \| Loop until done
	460
	461	lea biosram,a0 \| Clear BIOS ram ...
	462	lea SSTACK-2,a1 \| ... from biosram to SSTACK-1
	463
	464	binit2: move.w #0,(a0)+ \| Zero a word
	465	cmpa.l a0,a1 \| Last one ?
	466	bne binit2 \| Loop if not
	467
	468	move.l #rsarea,savptr \| Setup pointer to register area
	469	move.l #RSMAGIC,_rsflag \| Set magic in _rsflag
	470
	471	move.l #nullrts,timevec \| Set timer interrupt vector
	472	move.l #nullrts,critvec \| Set critical error vector
	473	move.l #nullrts,termvec \| Set process terminate vector
	474	move.l #nullrts,resvec3 \| Set software vector 3
	475	move.l #nullrts,resvec4 \| Set software vector 4
	476	move.l #nullrts,resvec5 \| Set software vector 5
	477	move.l #nullrts,resvec6 \| Set software vector 6
	478	move.l #nullrts,resvec7 \| Set software vector 7
	479
	480	move.l #hardhlt,0x0008 \| Set bus error vector
	481	move.l #nullrte,0x0014 \| Set divide error vector
	482	move.l #nullrte,0x0018 \| Set CHK vector
	483	move.l #nullrte,0x001C \| Set TRAPV vector
	484	move.l #nullrte,0x0024 \| Set trace vector
	485
	486	move.l #nullrte,0x0030 \| Set reserved vector 12
	487	move.l #nullrte,0x0034 \| Set reserved vector 13
	488	move.l #nullrte,0x0038 \| Set reserved vector 14
	489
	490	move.l #nullrte,0x003C \| Set uninitialized int. vector
	491
	492	move.l #nullrte,0x0040 \| Set reserved vector 16
	493	move.l #nullrte,0x0044 \| Set reserved vector 17
	494	move.l #nullrte,0x0048 \| Set reserved vector 18
	495	move.l #nullrte,0x004C \| Set reserved vector 19
	496	move.l #nullrte,0x0050 \| Set reserved vector 20
	497	move.l #nullrte,0x0054 \| Set reserved vector 21
	498	move.l #nullrte,0x0058 \| Set reserved vector 22
	499	move.l #nullrte,0x005C \| Set reserved vector 23
	500
	501	move.l #nullrte,0x0060 \| Set spurious int. vector
	502
	503	move.l #serintr,0x0074 \| Set ACIA interrupt vector
	504	move.l #nullrte,0x0078 \| Set level 6 vector
	505	move.l #nullrte,0x007C \| Set level 7 vector
	506
	507	move.l #trap13,0x00B4 \| Set trap13 vector
	508	move.l #trap14,0x00B8 \| Set trap14 vector
	509
	510	.page
	511
[f40a309]	512	.ifne BUCHLA
[4f508e6]	513
	514	move.l #nullfpu,0x0068 \| Set FPU interrupt vector
	515	move.l #api_int,0x006C \| Set analog trap vector
	516	move.l #timeint,0x0070 \| Set timer trap vector
	517
	518	move.l #_hdvini,hdv_init \| Set disk init vector
	519	move.l #getbpb,hdv_bpb \| Set get BPB vector
	520	move.l #rwabs,hdv_rw \| Set disk I/O vector
	521	move.l #bootload,hdv_boot \| Setup boot load vector
	522	move.l #mediach,hdv_mchg \| Setup media change vector
	523
	524	move.w #0xFFFF,fverify \| Set read after write flag
	525	move.w #FL_SKR,seekrate \| Set default seek rate
	526	move.w #0xFFFF,booted \| Say we're not booted yet
	527	move.l #buffer,dskbufp \| Setup default disk buffer
	528
	529	.page
	530
	531	move.b #7,PSG_WL \| Select PSG R7
	532	move.b #0x80,PSG_WD \| Write 0x80 (port B = output)
	533	move.b #15,PSG_WL \| Select PSG R15
	534	move.b #0x00,PSG_WD \| Write 0x00 (sync enable)
	535
	536	move.b #0x00,TIME_T1H \| Setup timer 1 (PLL)
	537	move.b #0x1F,TIME_T1L \| ... for divide by 64
	538	move.b #0x0C,TIME_T2H \| Setup timer 2 (FC)
	539	move.b #0x7F,TIME_T2L \| ... for divide by 3200
	540	move.b #0x03,TIME_T3H \| Setup timer 3 (RTC)
	541	move.b #0x20,TIME_T3L \| ... for 1Ms interval
	542	move.b #0x42,TIME_CRX \| Setup CR3
	543	move.b #0x41,TIME_CR2 \| Setup CR2
	544	move.b #0x81,TIME_CRX \| Setup CR1
	545	move.b #0x80,TIME_CRX \| Start the timers
	546
[f40a309]	547	.endc
[4f508e6]	548
	549	lea sr1iorec,a0 \| Serial-1 iorec address to a0
	550	lea SR1ACIA,a1 \| Serial-1 ACIA address to a1
	551	lea sr1dflt,a2 \| Serial-1 dflt table addr to a2
	552	bsr.w aciainit \| Go initialize the port
	553
	554	lea sr2iorec,a0 \| Serial-2 iorec address to a0
	555	lea SR2ACIA,a1 \| Serial-2 ACIA address to a1
	556	lea sr2dflt,a2 \| Serial-2 dflt table addr to a2
	557	bsr.w aciainit \| Go initialize the port
	558
[f40a309]	559	.ifne BUCHLA
[4f508e6]	560
	561	lea mc1iorec,a0 \| MIDI-1 iorec address to a0
	562	lea MC1ACIA,a1 \| MIDI-1 ACIA address to a1
	563	lea mc1dflt,a2 \| MIDI-1 dflt table addr to a2
	564	bsr.w aciainit \| Go initialize the port
	565
	566	lea mc2iorec,a0 \| MIDI-2 iorec address to a0
	567	lea MC2ACIA,a1 \| MIDI-2 ACIA address to a1
	568	lea mc2dflt,a2 \| MIDI-2 dflt table addr to a2
	569	bsr.w aciainit \| Go initialize the port
	570
	571	.page
	572
	573	lea VSDDINIT,a1 \| Setup to load VSDD regs
	574	lea vsddtab,a0 \| ... from vsddtab
	575	move.w #15,d0 \| ... all 16 registers
	576
	577	vsddinit: move.w (a0)+,(a1)+ \| Load the VSDD registers
[f40a309]	578	btst.l #0,d0
	579	btst.l #0,d0
	580	btst.l #0,d0
	581	dbf d0,vsddinit
[4f508e6]	582
	583	move.w vsddit02,VSDDINIT \| Enable the video
	584
	585	move.l #api_fum,api_fi \| Clear analog processor fifo
	586	move.l #api_fum,api_fo \| ...
	587
	588	move.w #23,d0 \| Setup to clear key LEDs
	589	move.b #0x80,d1 \| ...
	590
	591	ledclear: move.b d1,LEDS \| Clear a LED
	592	addq.b #1,d1 \| Increment LED number
	593	dbra d0,ledclear \| Loop until all are done
	594
	595	move.w #7,d0 \| Setup to clear pot LEDs
	596	move.b #0x18,d1 \| ...
	597
	598	ledclr2: move.b d1,LEDS \| Clear a LED
	599	addq.b #1,d1 \| Increment LED number
	600	dbra d0,ledclr2 \| Loop until all are done
	601
	602	clr.w fc_sw \| Stop the frame clock
	603	clr.l fc_val \| ... and reset it
	604
	605	.page
	606
	607	lea FPUBASE+FPU_CTL,a0 \| Point at FPU master level
	608	move.w #0x0000,0x08(a0) \| Set CV1 to 0
	609	addq.w #1,d0 \| Delay
	610	addq.w #1,d0 \| ...
	611	move.w #0x0000,0x0A(a0) \| Set SF1 to 0
	612	addq.w #1,d0 \| Delay
	613	addq.w #1,d0 \| ...
	614	move.w #0x0000,0x0C(a0) \| Set CV2 to 0
	615	addq.w #1,d0 \| Delay
	616	addq.w #1,d0 \| ...
	617	move.w #0x0000,0x0E(a0) \| Set SF2 to 0
	618	addq.w #1,d0 \| Delay
	619	addq.w #1,d0 \| ...
	620	move.w #0x0000,0x10(a0) \| Set CV3 to 0
	621	addq.w #1,d0 \| Delay
	622	addq.w #1,d0 \| ...
	623	move.w #0x0000,0x12(a0) \| Set SF3 to 0
	624	addq.w #1,d0 \| Delay
	625	addq.w #1,d0 \| ...
	626	move.w #0x8300,0x02(a0) \| Set new value '10' to -10.00
	627	addq.w #1,d0 \| Delay
	628	addq.w #1,d0 \| ...
	629	move.w #0x8300,0x1C(a0) \| Set new value '01' to -10.00
	630	addq.w #1,d0 \| Delay
	631	addq.w #1,d0 \| ...
	632	move.w #0x0001,0x16(a0) \| Set exponent for shortest time
	633	addq.w #1,d0 \| Delay
	634	addq.w #1,d0 \| ...
	635	move.w #0xFFF0,0x14(a0) \| Set mantissa for shortest time
	636	addq.w #1,d0 \| Delay
	637	addq.w #1,d0 \| ...
	638	move.w #0x0005,0x00(a0) \| Send control word to FPU
	639
[f40a309]	640	.endc
[4f508e6]	641
	642	.page
	643
	644	move.w #INITIPL,sr \| Enable interrupts
	645	lea basepage,a1 \| Pass start_ a pseudo base page
	646	move.l #_errno,p_bbase(a1) \| ...
	647	clr.l p_blen(a1) \| ...
	648	move.l a1,-(a7) \| ...
	649	jsr start_ \| Go start ROMP (we assume ...)
	650
	651	jmp biosinit \| Just in case we return ...
	652
	653	.page
	654
[f40a309]	655	.ifne BUCHLA
[4f508e6]	656
	657	\| nullfpu -- Null FPU trap handler
	658	\| ------- ---------------------
	659	nullfpu: movem.l d0-d0/a0-a0,-(a7) \| Save registers
	660	movea.l #FPUBASE,a0 \| Setup FPU base address in a0
	661	move.w FPU_IN(a0),d0 \| Read FPU interrupt port
	662	andi.l #0x000000FF,d0 \| Mask for voice & parameter
	663	lsl.l #5,d0 \| Shift for word offset
	664	addi.l #FPU_CTL,d0 \| Add FPU control offset
	665	move.w #FPU_RST,0(a0,d0.L) \| Reset the function
	666	clr.w FPU_CLR(a0) \| Clear the interrupt
	667	movem.l (a7)+,d0-d0/a0-a0 \| Restore registers
	668	rte \| Return to interrupted code
	669
[f40a309]	670	.endc
[4f508e6]	671
	672	.page
	673
	674	\| hardhlt -- Bus error trap handler
	675	\| ------- ----------------------
	676	hardhlt: stop #0x2700 \| stop dead -- system is AFU
	677	bra hardhlt \| ...
	678
	679	\| badtrap -- Bad trap handler
	680	\| ------- ----------------
	681	badtrap: move.w (a7)+,_crshsr \| Get crash SR
	682	move.l (a7)+,_crshpc \| Get crash PC
	683	move.l a7,_crshsp \| Get crash SP
	684	bsr badtr1 \| Get TRAP PC with vector number
[f40a309]	685	nop
[4f508e6]	686
	687	badtr1: move.l (a7)+,_crshvc \| Save for analysis of vector #
	688	movem.l d0-d7/a0-a7,_crshrg \| Save crash registers
	689	move.l usp,a0 \| Preserve crash USP
	690	move.l a0,_crshus \| ...
	691	move.l a7,d0 \| Get SP
	692	andi.l #0xFFFFFFFE,d0 \| ... make sure it's even
	693	movea.l d0,a1 \| ...
	694	move.w #15,d0 \| Save top 16 words
	695	lea _crshst,a0 \| ... of crash stack in _crshst
	696
	697	badtr2: move.w (a1)+,(a0)+ \| Save a stack value
	698	dbf d0,badtr2 \| Loop until all are saved
	699
	700	clr.l d0 \| Get TRAP number
	701	move.b _crshvc,d0 \| ... as LS byte of d0
	702	move.l _crshpc,a0 \| Save crash PC in a0
	703	move.w #0xFFFF,_wzcrsh \| Indicate we crashed
	704	move.l #rsarea,savptr \| Restore system save pointer
	705	move.l #SSTACK,a7 \| Reset the stack pointer
	706	move.l #RSMAGIC,_rsflag \| ... and the stack sentinel
	707	trap #15 \| TRAP to ROMP
	708
	709	jmp biosinit \| Recover with a cold start
	710
	711	.page
	712
[f40a309]	713	.ifne BUCHLA
[4f508e6]	714
	715	\| timeint -- Timer interrupt handler
	716	\| ------- -----------------------
	717	timeint: movem.l d0-d7/a0-a6,-(a7) \| Save registers
	718	move.b TIME_CR2,d0 \| Get timer interrupt status
	719	btst.l #2,d0 \| Check timer 3 status
	720	beq tmi02 \| Jump if not active
	721
	722	move.b TIME_T3H,d1 \| Read timer 1 count
	723	lsl.l #8,d1 \| ...
	724	move.b TIME_T3L,d1 \| ...
	725	move.w d1,t3count \| ... and save it
	726
	727	addq.l #1,_hz_1k \| Update 1ms clock (1 KHz)
	728
	729	move.w tdiv1,d1 \| Update divider
	730	addq.w #1,d1 \| ...
	731	move.w d1,tdiv1 \| ...
	732
	733	cmpi.w #5,d1 \| Do we need to update _hz_200 ?
	734	blt tmi02 \| Jump if not
	735
	736	addq.l #1,_hz_200 \| Update 5ms clock (200 Hz)
	737
	738	move.w tdiv2,d1 \| Update divider
	739	addq.w #1,d1 \| ...
	740	move.w d1,tdiv2 \| ...
	741
	742	cmpi.w #4,d1 \| Do we need to update frclock ?
	743	blt tmi01 \| Jump if not
	744
	745	addq.l #1,frclock \| Update 20 Ms clock (50 Hz)
	746	tst.w flock \| See if floppy is active
	747	bne tmi00 \| Don't call flopvbl if so
	748
	749	bsr flopvbl \| Check on the floppy
	750
	751	tmi00: move.w #0,tdiv2 \| Reset tdiv2
	752
	753	tmi01: move.w #0,tdiv1 \| Reset tdiv1
	754
	755	.page
	756
	757	tmi02: btst.l #0,d0 \| Check timer 1 int
	758	beq tmi03 \| Jump if not set
	759
	760	move.b TIME_T1H,d1 \| Read timer 1 to clear int.
	761	lsl.l #8,d1 \| ...
	762	move.b TIME_T1L,d1 \| ...
	763	move.w d1,t1count \| ... and save the count
	764
	765	tmi03: btst.l #1,d0 \| Check for timer 2 int.
	766	beq tmi04 \| Jump if not set
	767
	768	move.b TIME_T2H,d1 \| Read timer 2 to clear int.
	769	lsl.l #8,d1 \| ...
	770	move.b TIME_T2L,d1 \| ...
	771	move.w d1,t2count \| ... and save the count
	772
	773	tst.w fc_sw \| Should we update the frame ?
	774	beq tmi04 \| Jump if not
	775
	776	bmi tmi05 \| Jump if we count down
	777
	778	move.l fc_val,d0 \| Get the frame count
	779	cmp.l #FCMAX,d0 \| See it we've topped out
	780	bge tmi06 \| Jump if limit was hit
	781
	782	addq.l #1,d0 \| Count up 1 frame
	783	move.l d0,fc_val \| Store updated frame count
	784	bra tmi04 \| Done
	785
	786	tmi06: move.l #FCMAX,fc_val \| Force hard limit, just in case
	787	bra tmi04 \| Done
	788
	789	tmi05: move.l fc_val,d0 \| Get the frame count
	790	beq tmi04 \| Done if already zero
	791
	792	subq.l #1,d0 \| Count down 1 frame
	793	move.l d0,fc_val \| Store udpated frame count
	794
	795	movea.l timevec,a0 \| Do RTC vector
	796	move.w #1,-(a7) \| ... pass 1 msec on stack
	797	jsr (a0) \| ...
	798	addq.l #4,a7 \| ...
	799
	800	tmi04: movem.l (a7)+,d0-d7/a0-a6 \| Restore registers
	801	rte \| Return to interrupted code
	802
[f40a309]	803	.endc
[4f508e6]	804
	805	.page
	806
	807	\| trap14 -- Extended BIOS entry point
	808	\| ------ -------------------------
	809	trap14: lea t14tab,a0 \| Setup trap 14 table address
	810	bra trapent \| Go process trap
	811
	812	\| trap13 -- Main BIOS entry point
	813	\| ------ ---------------------
	814	trap13: lea t13tab,a0 \| Setup trap 13 table address
	815
	816	trapent: move.l savptr,a1 \| Get save area pointer
	817	move.w (a7)+,d0 \| Status register to D0
	818	move.w d0,-(a1) \| Save in save area
	819	move.l (a7)+,-(a1) \| Stash PC in save area
	820	movem.l d3-d7/a3-a7,-(a1) \| Save parameter register
	821	move.l a1,savptr \| Update save pointer
	822	btst #13,d0 \| Were we in sup. mode ?
	823	bne trwzsup \| Jump if so
	824
	825	move.l usp,a7 \| Move user sp to stack ptr.
	826
	827	trwzsup: move.w (a7)+,d0 \| Get function number from stack
	828	cmp.w (a0)+,d0 \| Check against limit
	829	bge trpexit \| Jump if it's invalid
	830
	831	lsl.w #2,d0 \| Multiply by 4 for use as index
	832	move.l 0(a0,d0),d0 \| Get routine address
	833	move.l d0,a0 \| ... into a0
	834	bpl trpnind \| Jump if it's indirect
	835
	836	move.l (a0),a0 \| Use indirect value
	837
	838	trpnind: sub.l a5,a5 \| Clear a5
	839	jsr (a0) \| Execute the routine
	840
	841	trpexit: move.l savptr,a1 \| Get SAVPTR into a1
	842	movem.l (a1)+,d3-d7/a3-a7 \| Restore registers
	843	move.l (a1)+,-(a7) \| Push return onto stack
	844	move.w (a1)+,-(a7) \| Push status onto stack
	845	move.l a1,savptr \| Update SAVPTR
	846
	847	\| nullrte -- null rte
	848	\| ------- --------
	849	nullrte: rte \| Return to interrupted code
	850
	851	\| nullrts -- null return
	852	\| ------- -----------
	853	nullrts: rts \| Just return to the caller
	854
	855	.page
	856
	857	\| bconstat -- Get character device input status
	858	\| -------- ---------------------------------
	859	bconstat: lea cdt01,a0 \| Point at status table
	860	bra condisp \| Jump to dispatcher
	861
	862	\| bconin -- Get input from character device
	863	\| ------ -------------------------------
	864	bconin: lea cdt02,a0 \| Point at input table
	865	bra condisp \| Jump to dispatcher
	866
	867	\| bconout -- Output to character device
	868	\| ------- --------------------------
	869	bconout: lea cdt03,a0 \| Point at output table
	870	bra condisp \| Jump to dispatcher
	871
	872	\| bcostat -- Get character device output status
	873	\| ------- ----------------------------------
	874	bcostat: lea cdt04,a0 \| Point at status table
	875
	876	\| condisp -- Character device function dispatcher
	877	\| ------- ------------------------------------
	878	condisp: move.w 4(a7),d0 \| Get device number
	879	lsl.w #2,d0 \| ... times 4 for pointer
	880	move.l 0(a0,d0),a0 \| Get routine address
	881	jmp (a0) \| Jump to it
	882
	883	.page
	884
	885	\| sr1ist -- Check CON (Serial-1) input buffer status
	886	\| ------ ----------------------------------------
	887	sr1ist: lea sr1iorec,a0 \| Address of iorec to a0
	888	lea SR1ACIA,a1 \| Address of ACIA to a1
	889	bra chkist \| Go check buffer status
	890
	891	\| sr2ist -- Check AUX (Serial-2) input buffer status
	892	\| ------ ----------------------------------------
	893	sr2ist: lea sr2iorec,a0 \| Address of iorec to a0
	894	lea SR2ACIA,a1 \| Address of ACIA to a1
	895
[f40a309]	896	.ifne BUCHLA
[4f508e6]	897
	898	bra chkist \| Go check buffer status
	899
	900	\| mc1ist -- Check MC1 (MIDI-1) input buffer status
	901	\| ------ --------------------------------------
	902	mc1ist: lea mc1iorec,a0 \| Address of iorec to a0
	903	lea MC1ACIA,a1 \| Address of ACIA to a1
	904	bra chkist \| Go check buffer status
	905
	906	\| mc2ist -- Check MC2 (MIDI-2) input buffer status
	907	\| ------ --------------------------------------
	908	mc2ist: lea mc2iorec,a0 \| Address of iorec to a0
	909	lea MC2ACIA,a1 \| Address of ACIA to a1
	910
[f40a309]	911	.endc
[4f508e6]	912
	913	\| chkist -- Check input buffer status
	914	\| ------ -------------------------
	915	chkist: moveq.l #-1,d0 \| Default to "Input available"
	916	lea ibufhd(a0),a2 \| Head index to a2
	917	lea ibuftl(a0),a3 \| Tail index to a3
	918	cmpm.w (a3)+,(a2)+ \| Buffer clear ?
	919	bne chkist1 \| Jump if not
	920
	921	moveq.l #0,d0 \| Set to "Buffer empty"
	922
	923	chkist1: rts \| Return to caller
	924
	925	.page
	926
	927	\| sr1ost -- Check CON (Serial-1) output buffer status
	928	\| ------ -----------------------------------------
	929	sr1ost: lea sr1iorec,a0 \| Address of iorec to a0
	930	bra chkost \| Go check buffer status
	931
	932	\| sr2ost -- Check AUX (Serial-2) output buffer status
	933	\| ------ -----------------------------------------
	934	sr2ost: lea sr2iorec,a0 \| Address of iorec to a0
	935
[f40a309]	936	.ifne BUCHLA
[4f508e6]	937
	938	bra chkost \| Go check buffer status
	939
	940	\| mc1ost -- Check MC1 (MIDI-1) output buffer status
	941	\| ------ ---------------------------------------
	942	mc1ost: lea mc1iorec,a0 \| Address of iorec to a0
	943	bra chkost \| Go check buffer status
	944
	945	\| mc2ost -- Check MC2 (MIDI-2) output buffer status
	946	\| ------ ---------------------------------------
	947	mc2ost: lea mc2iorec,a0 \| Address of iorec to a0
	948
[f40a309]	949	.endc
[4f508e6]	950
	951	\| chkost -- Check output buffer status
	952	\| ------ --------------------------
	953	chkost: moveq.l #-1,d0 \| Default to "Output OK"
	954	move.w obuftl(a0),d2 \| Tail index to d2
	955	bsr wrapout \| Test for pointer wraparound
	956	cmp.w obufhd(a0),d2 \| Compare with head index
	957	bne chkost1 \| Jump if not equal
	958
	959	moveq.l #0,d0 \| Set to "Buffer full"
	960
	961	chkost1: rts \| Return to caller
	962
	963	.page
	964
	965	\| wrapin -- Check input pointer for wraparound
	966	\| ------ ----------------------------------
	967	wrapin: add.w #1,d1 \| Head index +1
	968	cmp.w ibufsize(a0),d1 \| = buffer size ?
	969	bcs wrapin1 \| Jump if not
	970
	971	moveq.l #0,d1 \| Wraparound
	972
	973	wrapin1: rts \| Return to caller
	974
	975	\| wrapout -- Check output pointer for wraparound
	976	\| ------- -----------------------------------
	977	wrapout: addq.w #1,d2 \| Tail index +1
	978	cmp.w obufsize(a0),d2 \| = buffer size ?
	979	bcs wrapout1 \| Jump if not
	980
	981	moveq.l #0,d2 \| Wrap around if so
	982
	983	wrapout1: rts \| Return to caller
	984
	985	.page
	986
	987	\| sr1inp -- Get input from Serial-1 (wait on busy)
	988	\| ------ ---------------------------------------
	989	sr1inp: lea sr1iorec,a0 \| Serial-1 iorec address
	990	lea SR1ACIA,a1 \| Serial-1 ACIA base
	991	bra serinp \| Go get a byte
	992
	993	\| sr2inp -- Get input from Serial-2 (wait on busy)
	994	\| ------ ---------------------------------------
	995	sr2inp: lea sr2iorec,a0 \| Serial-2 iorec address
	996	lea SR2ACIA,a1 \| Serial-2 ACIA base
	997
	998	\| serinp -- Get a byte from a serial port (with handshaking)
	999	\| ------ -------------------------------------------------
	1000	serinp: bsr chkist \| Check input status
	1001	tst.w d0 \| Character ready ?
	1002	beq serinp \| Loop until one is ...
	1003
	1004	bsr getser \| Get a byte from the buffer
	1005	and.w #0xFFFF,d0 \| Isolate LS bits 7..0
	1006	rts \| Return to caller
	1007
	1008	.page
	1009
[f40a309]	1010	.ifne BUCHLA
[4f508e6]	1011
	1012	\| mc1inp -- Get input from MIDI-1 (wait on busy)
	1013	\| ------ -------------------------------------
	1014	mc1inp: lea mc1iorec,a0 \| MIDI-1 iorec address
	1015	lea MC1ACIA,a1 \| MIDI-1 ACIA base
	1016	bra midinp \| Go get a byte
	1017
	1018	\| mc2inp -- Get input from MIDI-2 (wait on busy)
	1019	\| ------ -------------------------------------
	1020	mc2inp: lea mc2iorec,a0 \| MIDI-2 iorec address
	1021	lea MC2ACIA,a1 \| MIDI-2 ACIA base
	1022
	1023	\| midinp -- Get input from a MIDI port (no handshaking)
	1024	\| ------ --------------------------------------------
	1025	midinp: bsr chkist \| Check input status
	1026	tst.w d0 \| Character ready ?
	1027	beq midinp \| Loop until one is ...
	1028
	1029	move.w sr,-(a7) \| Save status register
	1030	ori.w #IPL7,sr \| Set IPL = 7 (disable ints)
	1031	move.w ibufhd(a0),d1 \| Head index to d1
	1032	cmp.w ibuftl(a0),d1 \| Compare to tail index
	1033	beq midin_1 \| Jump if (somehow) empty
	1034
	1035	addq.w #1,d1 \| Increment head index
	1036	cmp.w ibufsize(a0),d1 \| Did pointer wrap around ?
	1037	bcs midin_2 \| Jump if not
	1038
	1039	moveq.l #0,d1 \| Wraparound
	1040
	1041	midin_2: move.l ibuf(a0),a2 \| Get buffer base address in a2
	1042	moveq.l #0,d0 \| Clear MS bits of d0
	1043	move.b 0(a2,d1),d0 \| Get character from buffer
	1044	move.w d1,ibufhd(a0) \| Update buffer head index
	1045
	1046	midin_1: move.w (a7)+,sr \| Restore status
	1047	rts \| Return to caller
	1048
[f40a309]	1049	.endc
[4f508e6]	1050
	1051	.page
	1052
	1053	\| getser -- Get a byte from a serial port buffer (with handshaking)
	1054	\| ------ --------------------------------------------------------
	1055	getser: move.w sr,-(a7) \| Save status register
	1056	ori.w #IPL7,sr \| Set IPL = 7 (disable ints)
	1057	move.w ibufhd(a0),d1 \| Get input buffer head index
	1058	cmp.w ibuftl(a0),d1 \| Compare tail index
	1059	beq rs_mt \| Jump if buffer empty
	1060
	1061	bsr wrapin \| Adjust pointer for wraparound
	1062	move.l ibuf(a0),a2 \| Get buffer address
	1063	moveq.l #0,d0 \| Clear out MS bits of d0
	1064	move.b 0(a2,d1),d0 \| Get character from buffer
	1065	move.w d1,ibufhd(a0) \| Update head index
	1066	move.w (a7)+,sr \| Restore status
	1067	andi #0xFFFE,sr \| Clear carry = OK
	1068	bra rs_xnf \| Go do XON/XOFF check
	1069
	1070	rs_mt: move.w (a7)+,sr \| Restore status
	1071	ori #0x0001,sr \| Set carry = no character there
	1072
	1073	rs_xnf: btst #0,linedisc(a0) \| Check for XON/XOFF mode
	1074	beq rs_exit \| Jump if not enabled
	1075
	1076	tst.b flagxon(a0) \| XON active ?
	1077	beq rs_exit \| Jump if not
	1078
	1079	bsr rsilen \| Get length of buffer used
	1080	cmp.w ibuflow(a0),d2 \| At low water mark ?
	1081	bne rs_exit \| Jump if not
	1082
	1083	move.b #0x11,d1 \| Send an XON
	1084	bsr serput \| ...
	1085	clr.b flagxon(a0) \| Clear XON flag
	1086
	1087	rs_exit: rts \| Return to caller
	1088
	1089	.page
	1090
	1091	\| sr1out -- Output to serial-1
	1092	\| ------ ------------------
	1093	sr1out: lea sr1iorec,a0 \| Serial-1 iorec address to a0
	1094	lea SR1ACIA,a1 \| Serial-1 ACIA address to a1
	1095	move.w 6(a7),d1 \| Get data byte from stack
	1096	bsr serput \| Attempt to output
	1097	bcs sr1out \| Try until it works ...
	1098
	1099	rts \| Return to caller
	1100
	1101	\| sr2out -- Output to Serial-2
	1102	\| ------ ------------------
	1103	sr2out: lea sr2iorec,a0 \| Serial-2 iorec address to a0
	1104	lea SR2ACIA,a1 \| Serial-2 ACIA address to a1
	1105	move.w 6(a7),d1 \| Get data byte from stack
	1106	bsr serput \| Attempt to output
	1107	bcs sr2out \| Try until it works ...
	1108
	1109	rts \| Return to caller
	1110
[f40a309]	1111	.ifne BUCHLA
[4f508e6]	1112
	1113	\| mc1out -- Output to MIDI-1
	1114	\| ------ ----------------
	1115	mc1out: lea mc1iorec,a0 \| MIDI-1 iorec address to a0
	1116	lea MC1ACIA,a1 \| MIDI-1 ACIA address to a1
	1117	move.w 6(a7),d1 \| Get data byte from stack
	1118	bsr midput \| Attempt to output
	1119	bcs mc1out \| Try until it works ...
	1120
	1121	rts \| Return to caller
	1122
	1123	\| mc2out -- Output to MIDI-2
	1124	\| ------ ----------------
	1125	mc2out: lea mc2iorec,a0 \| MIDI-2 iorec address to a0
	1126	lea MC2ACIA,a1 \| MIDI-2 ACIA address to a1
	1127	move.w 6(a7),d1 \| Get data byte from stack
	1128	bsr midput \| Attempt to output
	1129	bcs mc2out \| Try until it works ...
	1130
	1131	rts \| Return to caller
	1132
[f40a309]	1133	.endc
[4f508e6]	1134
	1135	.page
	1136
	1137	\| serput -- Output a character to a serial port
	1138	\| ------ -----------------------------------
	1139	serput: move.w sr,-(a7) \| Save status register
	1140	ori.w #IPL7,sr \| Set IPL = 7 (disable ints)
	1141	move.b ACIA_ISR(a1),isr(a0) \| Get ACIA isr
	1142	move.b ACIA_CSR(a1),csr(a0) \| Get ACIA csr
	1143	btst #0,linedisc(a0) \| XON/XOFF mode ?
	1144	beq serpt_1 \| Jump if not
	1145
	1146	tst.b flagxoff(a0) \| XON active ?
	1147	bne serpt_2 \| Jump if so
	1148
	1149	serpt_1: btst.b #6,isr(a0) \| Is ACIA still sending ?
	1150	beq serpt_2 \| Jump if so
	1151
	1152	move.w obufhd(a0),d2 \| Head index to d2
	1153	cmp.w obuftl(a0),d2 \| Compare to tail index
	1154	bne serpt_2 \| Jump if buffer not empty
	1155
	1156	move.b d1,ACIA_TDR(a1) \| Give byte to ACIA to send
	1157	bra serpt_3 \| Go deal with RTS/CTS if needed
	1158
	1159	serpt_2: move.w obuftl(a0),d2 \| Tail index to d2
	1160	bsr wrapout \| Adjust for wraparound
	1161	cmp.w obufhd(a0),d2 \| Compare to head index
	1162	beq serpt_4 \| Jump if buffer full
	1163
	1164	move.l obuf(a0),a2 \| Get buffer base address in a2
	1165	move.b d1,0(a2,d2) \| Put character in buffer
	1166	move.w d2,obuftl(a0) \| Update buffer tail index
	1167
	1168	serpt_3: bsr serchk \| Check status on our way out
	1169	bsr rtschk \| Handle RTS protocol
	1170	move.w (a7)+,sr \| Restore status register
	1171	andi #0xFFFE,sr \| Clear carry flag = OK
	1172	rts \| Return to caller
	1173
	1174	serpt_4: bsr serchk \| Check status on our way out
	1175	bsr rtschk \| Handle RTS protocol
	1176	move.w (a7)+,sr \| Restore status register
	1177	ori #0x0001,sr \| Set carry flag = buffer full
	1178	rts \| Return to caller
	1179
	1180	.page
	1181
[f40a309]	1182	.ifne BUCHLA
[4f508e6]	1183
	1184	\| midput -- Output to MIDI
	1185	\| ------ --------------
	1186	midput: move.w sr,-(a7) \| Save status register
	1187	ori.w #IPL7,sr \| Set IPL = 7 (diable ints)
	1188	move.b ACIA_ISR(a1),isr(a0) \| Get ACIA isr
	1189	move.b ACIA_CSR(a1),csr(a0) \| Get ACIA csr
	1190	btst.b #6,isr(a0) \| Is ACIA still sending ?
	1191	beq midpt_2 \| Jump if so
	1192
	1193	move.w obufhd(a0),d2 \| Head index to d2
	1194	cmp.w obuftl(a0),d2 \| Compare to tail index
	1195	bne midpt_2 \| Jump if buffer not empty
	1196
	1197	move.b d1,ACIA_TDR(a1) \| Give byte to ACIA to send
	1198	bra midpt_3 \| Go set final status and exit
	1199
	1200	midpt_2: move.w obuftl(a0),d2 \| Tail index to d2
	1201	bsr wrapout \| Adjust for wraparound
	1202	cmp.w obufhd(a0),d2 \| Compare to head index
	1203	beq midpt_4 \| Jump if buffer full
	1204
	1205	move.l obuf(a0),a2 \| Get buffer base address in a2
	1206	move.b d1,0(a2,d2) \| Put character in buffer
	1207	move.w d2,obuftl(a0) \| Update buffer tail index
	1208
	1209	midpt_3: bsr midchk \| Check status on our way out
	1210	move.w (a7)+,sr \| Restore status register
	1211	andi #0xFFFE,sr \| Clear carry flag = OK
	1212	rts \| Return to caller
	1213
	1214	midpt_4: bsr midchk \| Check status on our way out
	1215	move.w (a7)+,sr \| Restore status register
	1216	ori #0x0001,sr \| Set carry flag = buffer full
	1217	rts \| Return to caller
	1218
[f40a309]	1219	.endc
[4f508e6]	1220
	1221	.page
	1222
	1223	\| rtschk -- Check RTS mode and turn on RTS if it's enabled
	1224	\| ------ ----------------------------------------------
	1225	rtschk: btst #1,linedisc(a0) \| RTS/CTS mode set ?
	1226	beq rts_1 \| Jump if not
	1227
	1228	bsr rtson \| Turn on RTS
	1229
	1230	rts_1: rts \| Return to caller
	1231
	1232	\| rsilen -- Get length of portion of input buffer that's been used so far
	1233	\| ------ -------------------------------------------------------------
	1234	rsilen: move.w ibuftl(a0),d2 \| Tail index to d2
	1235	move.w ibufhd(a0),d3 \| Head index to d3
	1236	cmp.w d3,d2 \| Head > Tail ?
	1237	bhi rsi_1 \| Jump if not
	1238
	1239	add.w ibufsize(a0),d2 \| Add buffer size to tail index
	1240
	1241	rsi_1: sub.w d3,d2 \| Length = (adjusted)Tail - Head
	1242	rts \| Return to caller
	1243
	1244	\| rtson -- Turn on RTS line
	1245	\| ----- ----------------
	1246	rtson: move.b cfr1(a0),d0 \| Pick up CFR1 image
	1247	bclr #0,d0 \| Turn on RTS line (active low)
	1248	bset #7,d0 \| Make sure MS bit is set
	1249	move.b d0,cfr1(a0) \| Update CFR1 image
	1250	move.b d0,ACIA_CFR(a1) \| Send CFR to hardware
	1251	rts \| Return to caller
	1252
	1253	\| rtsoff -- Turn off RTS line
	1254	\| ------ -----------------
	1255	rtsoff: move.b cfr1(a0),d0 \| Pick up CFR1 image
	1256	bset #0,d0 \| Turn off RTS line (active low)
	1257	bset #7,d0 \| Make sure MS bit is set
	1258	move.b d0,cfr1(a0) \| Update CFR1 image
	1259	move.b d0,ACIA_CFR(a1) \| Send CFR to hardware
[f40a309]	1260	rts
[4f508e6]	1261
	1262	.page
	1263
	1264	\| serintr -- Serial (Serial-1, Serial-2, MIDI-1, MIDI-2) interrupt handler
	1265	\| ------- -------------------------------------------------------------
	1266	serintr: movem.l d0-d3/a0-a2,-(a7) \| Save registers
	1267	lea sr1iorec,a0 \| Point at Serial-1 iorec
	1268	lea SR1ACIA,a1 \| Point at Serial-1 ACIA
	1269	bsr serint \| Go process (possible) int.
	1270
	1271	lea sr2iorec,a0 \| Point at Serial-2 iorec
	1272	lea SR2ACIA,a1 \| Point at Serial-2 ACIA
	1273	bsr serint \| Go process (possible) int.
	1274
[f40a309]	1275	.ifne BUCHLA
[4f508e6]	1276
	1277	lea mc1iorec,a0 \| Point at MIDI-1 iorec
	1278	lea MC1ACIA,a1 \| Point at MIDI-1 ACIA
	1279	bsr midint \| Go process (possible) int.
	1280
	1281	lea mc2iorec,a0 \| Point at MIDI-2 iorec
	1282	lea MC2ACIA,a1 \| Point at MIDI-2 ACIA
	1283	bsr midint \| Go process (possible) int.
	1284
[f40a309]	1285	.endc
[4f508e6]	1286
	1287	movem.l (a7)+,d0-d3/a0-a2 \| Restore registers
	1288	rte \| Return from exception
	1289
	1290	.page
	1291
	1292	\| serint -- Process an interrupt from Serial-1 or Serial-2
	1293	\| ------ ----------------------------------------------
	1294	serint: move.b ACIA_ISR(a1),isr(a0) \| Get and save ISR
	1295	move.b ACIA_CSR(a1),csr(a0) \| Get and save CSR
	1296
	1297	btst.b #7,isr(a0) \| Was int for this device ?
	1298	beq serintx \| Jump if not
	1299
	1300	serchk: btst.b #1,isr(a0) \| FRM/OVR/BRK error ?
	1301	bne sererr \| Jump if so
	1302
	1303	btst.b #0,isr(a0) \| Receiver interrupt ?
	1304	bne serrx \| Jump if so
	1305
	1306	sertxq: btst.b #6,isr(a0) \| Transmitter interrupt ?
	1307	bne sertx \| Jump if so
	1308
	1309	serctq: btst.b #5,isr(a0) \| CTS interrupt ?
	1310	bne sercts \| Jump if so
	1311
	1312	serintx: rts \| Return to caller
	1313
	1314	sererr: addq.w #1,errct(a0) \| Update error count
	1315	move.b ACIA_RDR(a1),erbyte(a0) \| Get error byte
[f40a309]	1316	rts
[4f508e6]	1317
	1318	\| Handle CTS interupt
	1319
	1320	sercts: btst.b #1,linedisc(a0) \| RTS/CTS mode ?
	1321	beq serintx \| Ignore if not
	1322
	1323	btst.b #5,csr(a0) \| CTS set ?
	1324	beq serintx \| Ignore if not
	1325
	1326	sercts1: btst.b #6,isr(a0) \| TDRE set ?
	1327	beq sercts1 \| Loop until it is (!)
	1328
	1329	move.w obufhd(a0),d2 \| Head index to d2
	1330	cmp.w obuftl(a0),d2 \| Compare to tail index
	1331	beq serintx \| Done if buffer empty
	1332
	1333	bsr.w wrapout \| Adjust pointer for wraparound
	1334	move.l obuf(a0),a2 \| Get buffer base in a2
	1335	move.b 0(a2,d2),ACIA_TDR(a1) \| Send byte on its way
	1336	move.w d2,obufhd(a0) \| Save updated head index
[f40a309]	1337	rts
[4f508e6]	1338
	1339	.page
	1340
	1341	\| Handle receiver interrupt
	1342
	1343	serrx: btst.b #1,linedisc(a0) \| RTS/CTS mode set ?
	1344	beq serrx1 \| Jump if not
	1345
	1346	bsr.w rtsoff \| Turn off RTS
	1347
	1348	serrx1: move.b ACIA_RDR(a1),d0 \| Read data from ACIA
	1349	btst.b #1,linedisc(a0) \| RTS/CTS mode set ?
	1350	bne serrx3 \| Jump if so
	1351
	1352	btst.b #0,linedisc(a0) \| XON/XOFF mode set ?
	1353	beq serrx3 \| Jump if not
	1354
	1355	cmpi.b #0x11,d0 \| Is this an XON ?
	1356	bne serrx2 \| Jump if not
	1357
	1358	move.b #0x00,flagxoff(a0) \| Clear flagxoff
	1359	bra sertxq \| Done
	1360
	1361	serrx2: cmpi.b #0x13,d0 \| Is this an XOFF ?
	1362	bne serrx3 \| Jump if not
	1363
	1364	move.b #0xFF,flagxoff(a0) \| Set flagxoff
	1365	bra sertxq \| Done
	1366
	1367	serrx3: move.w ibuftl(a0),d1 \| Get tail index in d1
	1368	bsr.w wrapin \| Adjust for wraparound
	1369	cmp.w ibufhd(a0),d1 \| Head = tail ?
	1370	beq seribf \| If so, we drop the character
	1371
	1372	move.l ibuf(a0),a2 \| Get buffer address
	1373	move.b d0,0(a2,d1) \| Stash byte in buffer
	1374	move.w d1,ibuftl(a0) \| Save updated tail index
	1375	bsr rsilen \| Get length of buffer used
	1376	cmp.w ibufhi(a0),d2 \| Hit high water mark ?
	1377	bne serrx4 \| Jump if not
	1378
	1379	btst.b #1,linedisc(a0) \| RTS/CTS mode set ?
	1380	bne sertxq \| Done if so
	1381
	1382	btst.b #0,linedisc(a0) \| XON/XOFF mode set ?
	1383	beq serrx4 \| Jump if not
	1384
	1385	tst.b flagxon(a0) \| XOFF already sent ?
	1386	bne serrx4 \| Jump if so
	1387
	1388	move.b #0xFF,flagxon(a0) \| Set the flag
	1389	move.b #0x13,d1 \| Send an XOFF
	1390	bsr.w serput \| ...
	1391
	1392	.page
	1393
	1394	serrx4: btst #1,linedisc(a0) \| RTS/CTS mode set ?
	1395	beq sertxq \| Done if not
	1396
	1397	bsr rtson \| Turn on RTS
[f40a309]	1398	bra sertxq
[4f508e6]	1399
	1400	\| Handle transmitter interrupt
	1401
	1402	sertx: btst.b #1,linedisc(a0) \| RTS/CTS mode set ?
	1403	bne sertx2 \| If so, go check CTS
	1404
	1405	btst.b #0,linedisc(a0) \| XON/XOFF mode set ?
	1406	beq sertx1 \| Jump if not
	1407
	1408	tst.b flagxoff(a0) \| Check flagxoff
	1409	bne serctq \| Done if set
	1410
	1411	sertx1: move.w obufhd(a0),d2 \| Head index to d2
	1412	cmp.w obuftl(a0),d2 \| Compare to tail index
	1413	beq serctq \| Done if buffer empty
	1414
	1415	bsr wrapout \| Adjust pointer for wraparound
	1416	move.l obuf(a0),a2 \| Get buffer base address
	1417	move.b 0(a2,d2),ACIA_TDR(a1) \| Send byte on its way
	1418	move.w d2,obufhd(a0) \| Save updated head index
	1419	bra serctq \| Done
	1420
	1421	sertx2: btst.b #5,csr(a0) \| CTS set in csr ?
	1422	beq serctq \| If not, go check for CTS int
	1423
	1424	bra sertx1 \| CTS was set, go transmit
	1425
	1426	seribf: move.b d0,erbyte(a0) \| Log dropped character
	1427	addq.w #1,ibfct(a0) \| ...
	1428	bra sertxq \| Go check Tx interrupt
	1429
	1430	.page
	1431
[f40a309]	1432	.ifne BUCHLA
[4f508e6]	1433
	1434	\| midint -- Process an interrupt from MIDI-1 or MIDI-2
	1435	\| ------ ------------------------------------------
	1436	midint: move.b ACIA_ISR(a1),isr(a0) \| Get and save ISR
	1437	move.b ACIA_CSR(a1),csr(a0) \| Get and save CSR
	1438
	1439	btst.b #7,isr(a0) \| Was int for this device ?
	1440	beq midintx \| Jump if not
	1441
	1442	midchk: btst.b #1,isr(a0) \| FRM/OVR/BRK error ?
	1443	bne miderr \| Jump if so
	1444
	1445	btst.b #0,isr(a0) \| Receiver interrupt ?
	1446	bne midrx \| Jump if so
	1447
	1448	midtxq: btst.b #6,isr(a0) \| Transmitter interrupt ?
	1449	bne midtx \| Jump if so
	1450
	1451	midintx: rts \| Return to caller
	1452
	1453	miderr: addq.w #1,errct(a0) \| Update error count
	1454	move.b ACIA_RDR(a1),erbyte(a0) \| Get error byte
[f40a309]	1455	rts
[4f508e6]	1456
	1457	\| Handle receiver interrupt
	1458
	1459	midrx: move.b ACIA_RDR(a1),d0 \| Read data from ACIA
	1460	move.w ibuftl(a0),d1 \| Get tail index in d1
	1461	bsr.w wrapin \| Adjust for wraparound
	1462	cmp.w ibufhd(a0),d1 \| Head = tail ?
	1463	beq midibf \| If so, we drop the character
	1464
	1465	move.l ibuf(a0),a2 \| Get buffer address
	1466	move.b d0,0(a2,d1) \| Stash byte in buffer
	1467	move.w d1,ibuftl(a0) \| Save updated tail index
	1468	bra midtxq \| Done (go check tx int)
	1469
	1470	.page
	1471
	1472	\| Handle transmitter interrupt
	1473
	1474	midtx: move.w obufhd(a0),d2 \| Head index to d2
	1475	cmp.w obuftl(a0),d2 \| Compare to tail index
	1476	beq midintx \| Done if buffer empty
	1477
	1478	bsr wrapout \| Adjust pointer for wraparound
	1479	move.l obuf(a0),a2 \| Get buffer base address
	1480	move.b 0(a2,d2),ACIA_TDR(a1) \| Send byte on its way
	1481	move.w d2,obufhd(a0) \| Save updated head index
	1482	bra midintx \| Done
	1483
	1484	midibf: move.b d0,erbyte(a0) \| Log dropped character
	1485	addq.w #1,ibfct(a0) \| ...
	1486	bra midtxq \| Go check Tx interrupt
	1487
[f40a309]	1488	.endc
[4f508e6]	1489
	1490	.page
	1491
	1492	\| setexec -- Set an exception vector
	1493	\| ------- -----------------------
	1494	setexec: move.w 4(a7),d0 \| Get vector number
	1495	lsl.w #2,d0 \| .. times 4
	1496	sub.l a0,a0 \| Clear a0
	1497	lea 0(a0,d0),a0 \| Get address of old vector
	1498	move.l (a0),d0 \| Move old vector to d0
	1499	move.l 6(a7),d1 \| Pick up new vector
	1500	bmi setexec1 \| Don't set if = -1
	1501
	1502	move.l d1,(a0) \| Set new vector
	1503
	1504	setexec1: rts \| Return to caller
	1505
	1506	\| piorec -- Get pointer to iorec structure
	1507	\| ------ ------------------------------
	1508	piorec: moveq.l #0,d1 \| Clear out d1
	1509	move.w 4(a7),d1 \| Get device number
	1510	move.w sr,-(a7) \| Save status register
	1511	ori.w #IPL7,sr \| Set IPL = 7 (no ints)
	1512	lea iortab,a2 \| Get base address of table
	1513	asl.l #2,d1 \| Device # times 4 for index
	1514	move.l 0(a2,d1),d0 \| Get iorec address from table
	1515	move.w (a7)+,sr \| Restore status register
	1516	rts \| Return to caller
	1517
	1518	.page
	1519
	1520	\| setport -- Set ACIA parameters (unit, mode, baud, CFR0, CFR1)
	1521	\| ------- ---------------------------------------------------
	1522	setport: moveq.l #0,d1 \| Clear out d1
	1523	move.w 4(a7),d1 \| Get device number
	1524	asl.l #3,d1 \| Times 8 for index
	1525	ori.w #IPL7,sr \| Set IPL = 7 (no ints)
	1526	lea aciatab,a2 \| Get base of table
	1527	move.l 0(a2,d1),d0 \| Get iorec address
	1528	move.l 4(a2,d1),d2 \| Get ACIA address
	1529	movea.l d0,a0 \| Setup a0 = iorec address
	1530	movea.l d2,a1 \| Setup a1 = ACIA address
	1531	tst.w 6(a7) \| Change mode ?
	1532	bmi setpt1 \| Jump if not
	1533
	1534	move.b 7(a7),linedisc(a0) \| Set line discipline (mode)
	1535
	1536	setpt1: tst.w 8(a7) \| Change baud rate ?
	1537	bmi setpt2 \| Jump if not
	1538
	1539	moveq.l #0,d1 \| Clear out d1
	1540	move.w 8(a7),d1 \| Get baud rate index
	1541	lea brtable,a2 \| Get base of baud rate table
	1542	move.b 0(a2,d1),d2 \| Get baud rate code from table
	1543	move.b cfr0(a0),d0 \| Get current CFR0
	1544	andi.w #0x0070,d0 \| Mask off old baud rate code
	1545	or.w d2,d0 \| OR in new baud rate code
	1546	move.b d0,cfr0(a0) \| Update CFR0 in table
	1547	move.b d0,ACIA_CFR(a1) \| Update hardware
	1548
	1549	setpt2: tst.w 10(a7) \| Change CFR0 ?
	1550	bmi setpt3 \| Jump if not
	1551
	1552	move.b 11(a7),cfr0(a0) \| Update CFR0 in table
	1553	move.b cfr0(a0),ACIA_CFR(a1) \| Update CFR0 in hardware
	1554
	1555	setpt3: tst.w 12(a7) \| Change CFR1 ?
	1556	bmi setpt4 \| Jump if not
	1557
	1558	bset.b #7,13(a7) \| Force D7 = 1 in argument
	1559	move.b 13(a7),cfr1(a0) \| Update CFR1 in table
	1560	move.b cfr1(a0),ACIA_CFR(a1) \| Update CFR1 in hardware
	1561
	1562	setpt4: rts \| Return to caller
	1563
	1564	.page
	1565
	1566	\| aciainit -- Initialize an ACIA port
	1567	\| -------- -----------------------
	1568	aciainit: move.w #IORECLN,d0 \| Setup byte count for move
	1569	move.l a0,-(a7) \| Save iorec base
	1570
	1571	aciai_1: move.b (a2)+,(a0)+ \| Move the default to the iorec
	1572	dbf d0,aciai_1 \| ...
	1573
	1574	move.l (a7)+,a0 \| Restore iorec base
	1575	move.b cfr0(a0),ACIA_CFR(a1) \| Setup CFR0
	1576	move.b cfr1(a0),ACIA_CFR(a1) \| Setup CFR1
	1577	move.b ACIA_RDR(a1),d0 \| Clear RDR
	1578	move.b #0x7F,ACIA_IER(a1) \| Disable all interrupts
	1579	btst.b #1,linedisc(a0) \| Are we in RTS/CTS mode ?
	1580	bne aciai_2 \| Jump if so
	1581
	1582	move.b #0xC3,ACIA_IER(a1) \| Enable TDRE, RDRF
	1583	bra aciai_3 \| Go return
	1584
	1585	aciai_2: move.b #0xE3,ACIA_IER(a1) \| Enable interrupts we want
	1586
	1587	aciai_3: rts \| Return to caller
	1588
	1589	.page
	1590
[f40a309]	1591	.ifne BUCHLA
[4f508e6]	1592
	1593	\| fastcopy -- Copy disk sector quickly
	1594	\| -------- ------------------------
	1595	fastcopy: move.l 4(a7),a0 \| Get source pointer
	1596	move.l 8(a7),a1 \| Get destination pointer
	1597	move.w 0x3F,d0 \| 512 bytes (63+1)\|8
	1598
	1599	fastcpy1: move.b (a0)+,(a1)+ \| Move 8 bytes
	1600	move.b (a0)+,(a1)+ \| ...
	1601	move.b (a0)+,(a1)+ \| ...
	1602	move.b (a0)+,(a1)+ \| ...
	1603	move.b (a0)+,(a1)+ \| ...
	1604	move.b (a0)+,(a1)+ \| ...
	1605	move.b (a0)+,(a1)+ \| ...
	1606	move.b (a0)+,(a1)+ \| ...
	1607	dbra d0,fastcpy1 \| Loop until all bytes are moved
	1608
	1609	rts \| Return to caller
	1610
	1611	.page
	1612
	1613	\| _hdvini -- Drive initialization
	1614	\| ------- --------------------
	1615	_hdvini: link a6,#-18 \| Reserve space on stack
	1616	movem.l d3-d7/a3-a5,-(a7) \| Preserve registers
	1617	move.l #300,maxactim \| maxactim = 300 \| 20ms
	1618	clr.w d0 \| Put zeros in ...
	1619	move.w d0,nflops \| ... nflops
	1620	move.w d0,dskmode \| ... dskmode
	1621	move.w d0,-2(a6) \| Start with drive A
	1622	bra hdvilp \| ...
	1623
	1624	hdvilp1: movea.l #dskmode,a0 \| Get dskmode address in a0
	1625	movea.w -2(a6),a1 \| Drive number in a1
	1626	adda.l a1,a0 \| Point at dskmode for drive
	1627	clr.b (a0) \| Clear flag in dskmode
	1628	clr.w -(a7) \| Push arguments onto stack
	1629	clr.w -(a7) \| ...
	1630	clr.w -(a7) \| ...
	1631	move.w -2(a6),-(a7) \| Push drive number onto stack
	1632	clr.l -(a7) \| ... filler
	1633	clr.l -(a7) \| ... filler
	1634	jsr flopini \| Initialize drive
	1635	adda.l #16,a7 \| Cleanup stack
	1636	move.w d0,-(a7) \| Save error code on stack
	1637	movea.w -2(a6),a0 \| Get drive number
	1638	adda.l a0,a0 \| ... times 2
	1639	adda.l #dskerrs,a0 \| Add base of dskerrs
	1640	move.w (a7)+,(a0) \| Move error code off of stack
	1641	bne hdvind \| Jump if drive not present
	1642
	1643	addq.w #1,nflops \| Update number of drives
	1644	or.l #3,drvbits \| Setup drive bits
	1645
	1646	hdvind: addq.w #1,-2(a6) \| Increment drive number
	1647
	1648	hdvilp: cmp.w #2,-2(a6) \| See if it's 2 yet
	1649	blt hdvilp1 \| Loop until it is
	1650
	1651	movem.l (a7)+,d3-d7/a3-a5 \| Restore registers
	1652	unlk a6 \| Release temporary stack space
	1653	rts \| Return to caller
	1654
	1655	\| drvmap -- get drive map
	1656	\| ------ -------------
	1657	drvmap: move.l drvbits,d0 \| Get drive bits
	1658	rts \| Return to caller
	1659
	1660	.page
	1661
	1662	\| getbpb -- get BIOS parameter block
	1663	\| ------ ------------------------
	1664	getbpb: link a6,#-12 \| Reserve space for temporaries
	1665	movem.l d5-d7/a4-a5,-(a7) \| Save registers on stack
	1666	cmp.w #2,8(a6) \| Check drive number
	1667	blt gbpb1 \| Jump if OK
	1668
	1669	clr.l d0 \| Set drive number to 0
	1670	bra gbpber \| Go flag error
	1671
	1672	gbpb1: move.w 8(a6),d0 \| Get drive number
	1673	asl.w #5,d0 \| ... times 32
	1674	ext.l d0 \| ... extend sign
	1675	move.l d0,a5 \| Move to a5
	1676	add.l #drvbpbs,a5 \| Add base of drive bpb are
	1677	move.l a5,a4 \| Save in a4
	1678
	1679	gbpbrds: move.w #1,(a7) \| floprd count = 1,
	1680	clr.w -(a7) \| ... side = 0,
	1681	clr.w -(a7) \| ... track = 0,
	1682	move.w #1,-(a7) \| ... sector = 1,
	1683	move.w 8(a6),-(a7) \| ... drive #,
	1684	clr.l -(a7) \| ... filler
	1685	move.l #buffer,-(a7) \| ... buffer address,
	1686	jsr floprd \| Go read the sector
	1687	add.l #16,a7 \| Cleanup stack
	1688	move.l d0,-12(a6) \| Save error code
	1689	tst.l -12(a6) \| ... and test it
	1690	bge gbpb2 \| Jump if OK
	1691
	1692	move.w 8(a6),(a7) \| Put drive number on stack
	1693	move.l -12(a6),d0 \| Get error code
	1694	move.w d0,-(a7) \| ... and put it on the stack
	1695	jsr criter \| Go do critical error routine
	1696	addq.l #2,a7 \| Cleanup stack
	1697	move.l d0,-12(a6) \| Save error code
	1698
	1699	gbpb2: move.l -12(a6),d0 \| Get error code
	1700	cmp.l #RETRYIT,d0 \| Magic number for retry ?
	1701	beq gbpbrds \| Re-read if so
	1702
	1703	tst.l -12(a6) \| Test error code
	1704	bge gbpb3 \| Jump if OK
	1705
	1706	clr.l d0 \| Set code in d0
	1707	bra gbpber \| Go set error code
	1708
	1709	.page
	1710
	1711	gbpb3: move.l #buffer+11,(a7) \| Bytes per sector
	1712	bsr itom \| Convert 8086 to 68K format
	1713	move.w d0,d7 \| Save bytes per sector
	1714	beq gbpb4 \| Jump if zero
	1715
	1716	move.b buffer+13,d6 \| Sectors per cluster
	1717	ext.w d6 \| ... sign extended
	1718	and.w #0xFF,d6 \| ... and trimmed
	1719	bne gbpb5 \| Jump if non-zero
	1720
	1721	gbpb4: clr.l d0 \| Set error code
	1722	bra gbpber \| ...
	1723
	1724	gbpb5: move.w d7,(a4) \| Set recsize
	1725	move.w d6,2(a4) \| Set clsiz
	1726	move.l #buffer+22,(a7) \| Convert sectors per fat
	1727	bsr itom \| ...
	1728	move.w d0,8(a4) \| Set fsiz
	1729	move.w 8(a4),d0 \| Get fsiz
	1730	addq.w #1,d0 \| ... plus 1
	1731	move.w d0,10(a4) \| Set fatrec
	1732	move.w (a4),d0 \| Get recsize
	1733	muls.w 2(a4),d0 \| ... times clsiz
	1734	move.w d0,4(a4) \| Set clsizb
	1735	move.l #buffer+17,(a7) \| Convert number of dir ents
	1736	bsr itom \| ...
	1737	asl.w #5,d0 \| ... times 32
	1738	ext.l d0 \| ... sign extended
	1739	divs.w (a4),d0 \| ... / recsize
	1740	move.w d0,6(a4) \| Set rdlen
	1741	move.w 10(a4),d0 \| Get fatrec
	1742	add.w 6(a4),d0 \| ... + rdlen
	1743	add.w 8(a4),d0 \| ... + fsiz
	1744	move.w d0,12(a4) \| Set datrec
	1745	move.l #buffer+19,(a7) \| Get number of sectors
	1746	bsr itom \| ... convert
	1747	sub.w 12(a4),d0 \| ... - datrec
	1748	ext.l d0 \| ... sign extended
	1749	divs.w 2(a4),d0 \| ... / clsiz
	1750	move.w d0,14(a4) \| Set numcl
	1751
	1752	.page
	1753
	1754	move.l #buffer+26,(a7) \| Convert number of heads
	1755	bsr itom \| ...
	1756	move.w d0,20(a5) \| Set dnsides
	1757	move.l #buffer+24,(a7) \| Convert sectors per track
	1758	bsr itom \| ...
	1759	move.w d0,24(a5) \| Set dspt
	1760	move.w 20(a5),d0 \| Get dnsides
	1761	muls.w 24(a5),d0 \| ... \| dspt
	1762	move.w d0,22(a5) \| Set dspc
	1763	move.l #buffer+28,(a7) \| Convert number of hidden sects
	1764	bsr itom \| ...
	1765	move.w d0,26(a5) \| Set dhidden
	1766	move.l #buffer+19,(a7) \| Convert sectors on disk
	1767	bsr itom \| ...
	1768	ext.l d0 \| ... sign extended
	1769	divs.w 22(a5),d0 \| ... / dspc
	1770	move.w d0,18(a5) \| Set dntracks
	1771	clr.w d7 \| Counter = 0
	1772	bra gbpblpt \| Jump to end of loop
	1773
	1774	gbpb6: move.l a5,a0 \| Get buffer pointer
	1775	move.w d7,a1 \| Loop count to a1
	1776	add.l a1,a0 \| ... + bpb address
	1777	move.w d7,a1 \| Loop count to a1
	1778	add.l #buffer,a1 \| ... + buffer address
	1779	move.b 8(a1),28(a0) \| Copy a s/n byte
	1780	addq.w #1,d7 \| Update loop count
	1781
	1782	gbpblpt: cmp.w #3,d7 \| Moved 3 bytes ?
	1783	blt gbpb6 \| Loop if not
	1784
	1785	.page
	1786
	1787	move.l #cdev,a0 \| Address of cdev table
	1788	move.w 8(a6),a1 \| ... plus drive number
	1789	add.l a1,a0 \| ... to a0
	1790	move.l #wpstatus,a1 \| Address of wpstatus table
	1791	move.w 8(a6),a2 \| ... plus drive number
	1792	add.l a2,a1 \| ... to a1
	1793	move.b (a1),(a0) \| Move wpstatus to cdev
[f40a309]	1794	beq gbpb7
[4f508e6]	1795
	1796	moveq.l #1,d0 \| Set status = "Uncertain"
[f40a309]	1797	bra gbpb8
[4f508e6]	1798
	1799	gbpb7: clr.w d0 \| Set status = "Unchanged"
	1800
	1801	gbpb8: move.l #dskmode,a1 \| Update dskmode table
	1802	move.w 8(a6),a2 \| ...
	1803	add.l a2,a1 \| ...
	1804	move.b d0,(a1) \| ...
	1805	move.l a5,d0 \| Setup to return bpb pointer
	1806
	1807	gbpber: tst.l (a7)+ \| Pop garbage off top of stack
	1808	movem.l (a7)+,d6-d7/a4-a5 \| Restore registers
[f40a309]	1809	unlk a6
	1810	rts
[4f508e6]	1811
	1812	.page
	1813
	1814	\| mediach -- check for media change
	1815	\| ------- ----------------------
	1816	mediach: link a6,#0 \| Create scratch on stack
	1817	movem.l d6-d7/a5,-(a7) \| Save registers on stack
	1818	cmp.w #2,8(a6) \| Check drive number
	1819	blt media1 \| Jump if OK
	1820
	1821	moveq.l #ERR15,d0 \| Error -- "unknown device"
	1822	bra media2 \| ...
	1823
	1824	media1: move.w 8(a6),d7 \| Get drive number in d7
	1825	movea.w d7,a5 \| Point into dskmode table
	1826	add.l #dskmode,a5 \| ...
	1827	cmp.b #2,(a5) \| Definitely changed ?
	1828	bne media3 \| Jump if not
	1829
	1830	moveq.l #2,d0 \| Setup to return "Changed"
	1831	bra media2 \| Done -- go return to caller
	1832
	1833	media3: move.l #wplatch,a0 \| Check wplatch for drive
	1834	tst.b 0(a0,d7) \| ...
	1835	beq media4 \| Jump if not set
	1836
	1837	move.b #1,(a5) \| Set dskmode to "Uncertain"
	1838
	1839	media4: move.l _hz_200,d0 \| Get time in d0
	1840	movea.w d7,a1 \| Calculate acctim table address
	1841	add.l a1,a1 \| ... = drive # \| 4
	1842	add.l a1,a1 \| ...
	1843	add.l #acctim,a1 \| ... + acctim base address
	1844	move.l (a1),d1 \| Get acctim for drive
	1845	sub.l d1,d0 \| Subtract from current time
	1846	cmp.l maxactim,d0 \| Timed out ?
	1847	bge media5 \| Jump if so
	1848
	1849	clr.w d0 \| Setup to return "Unchanged"
[f40a309]	1850	bra media2
[4f508e6]	1851
	1852	media5: move.b (a5),d0 \| Return status from dskmode
[f40a309]	1853	ext.w d0
[4f508e6]	1854
	1855	media2: tst.l (a7)+ \| Pop extra stack word
	1856	movem.l (a7)+,d7/a5 \| Restore registers
[f40a309]	1857	unlk a6
[4f508e6]	1858	rts \| Return to caller
	1859
	1860	.page
	1861
	1862	\| rwabs -- read / write sector(s)
	1863	\| ----- ----------------------
	1864	rwabs: link a6,#-4 \| Reserve stack for temps
	1865	movem.l d4-d7/a5,-(a7) \| Save registers on stack
	1866	cmp.w #2,18(a6) \| Drive number
[f40a309]	1867	blt rwabs1
[4f508e6]	1868
	1869	moveq.l #ERR15,d0 \| ERROR -- "unknown device"
[f40a309]	1870	bra rwabser
[4f508e6]	1871
	1872	rwabs1: move.w 18(a6),d6 \| Save drive number
	1873	cmp.w #2,8(a6) \| Check rwflag
[f40a309]	1874	bge rwabs7
[4f508e6]	1875
[f40a309]	1876	move.w d6,d0
	1877	asl.w #5,d0
	1878	ext.l d0
	1879	move.l d0,a5
	1880	add.l #drvbpbs,a5
	1881	move.w d6,(a7)
[4f508e6]	1882	bsr mediach \| Test for media change
	1883	move.w d0,d7 \| Save status
	1884	cmp.w #2,d7 \| Disk changed ?
	1885	bne rwabs2 \| Jump if not
	1886
	1887	moveq.l #ERR14,d0 \| ERROR -- "media changed"
	1888	bra rwabser \| ...
	1889
	1890	rwabs2: cmp.w #1,d7 \| Disk possibly changed ?
[f40a309]	1891	bne rwabs7
[4f508e6]	1892
	1893	rwabs3: move.w #1,(a7) \| floprd count = 1,
	1894	clr.w -(a7) \| ... side = 0,
	1895	clr.w -(a7) \| ... track = 0,
	1896	move.w #1,-(a7) \| ... sector = 1,
	1897	move.w d6,-(a7) \| ... drive number,
	1898	clr.l -(a7) \| ... filler,
	1899	move.l #buffer,-(a7) \| ... buffer address,
	1900	jsr floprd \| Read boot sector
	1901	add.l #16,a7 \| Cleanup stack
	1902	move.l d0,-4(a6) \| Save error number
	1903	tst.l -4(a6) \| ... and test it
	1904	bge rwabs11 \| Jump if OK
	1905
	1906	.page
	1907
[f40a309]	1908	move.w d6,(a7)
	1909	move.l -4(a6),d0
	1910	move.w d0,-(a7)
[4f508e6]	1911	jsr criter \| Call critical error code
	1912	addq.l #2,a7 \| Cleanup stack
[f40a309]	1913	move.l d0,-4(a6)
[4f508e6]	1914
[f40a309]	1915	rwabs11: move.l -4(a6),d0
	1916	cmp.l #RETRYIT,d0
[4f508e6]	1917	beq rwabs3 \| Read again
	1918
	1919	tst.l -4(a6) \| Test error number
	1920	bge rwabs4 \| OK ?
	1921
[f40a309]	1922	move.l -4(a6),d0
[4f508e6]	1923	bra rwabser \| ERROR
	1924
	1925	rwabs4: clr.w d7 \| Clear media change status
[f40a309]	1926	bra rwabs10
[4f508e6]	1927
	1928	rwabs6: move.l #buffer,a0 \| Address of sector buffer to a0
	1929	move.b 8(a0,d7),d0 \| Serial number
[f40a309]	1930	ext.w d0
[4f508e6]	1931	move.b 28(a5,d7),d1 \| Compare to old one
[f40a309]	1932	ext.w d1
	1933	cmp.w d1,d0
[4f508e6]	1934	beq rwabs5 \| Jump if they're the same
	1935
	1936	moveq.l #ERR14,d0 \| ERROR -- "media changed"
[f40a309]	1937	bra rwabser
[4f508e6]	1938
	1939	rwabs5: addq.w #1,d7 \| Next byte of serial number
	1940
	1941	rwabs10: cmp.w #3,d7 \| All 3 bytes checked ?
	1942	blt rwabs6 \| Loop if not
	1943
	1944	.page
	1945
	1946	move.w d6,a0 \| Point at wplatch for drive
	1947	add.l #wplatch,a0 \| ...
	1948	move.w d6,a1 \| Point at wpstatus for drive
	1949	add.l #wpstatus,a1 \| ...
	1950	move.b (a1),(a0) \| Move wpstatus to wplatch
	1951	bne rwabs9 \| Jump if set
	1952
	1953	move.w d6,a0 \| Set dskmode to "Unchanged"
	1954	add.l #dskmode,a0 \| ...
	1955	clr.b (a0) \| ...
	1956
	1957	rwabs7: tst.w nflops \| Test nflops
[f40a309]	1958	bne rwabs8
[4f508e6]	1959
	1960	moveq.l #ERR02,d0 \| ERROR -- "drive not ready"
[f40a309]	1961	bra rwabser
[4f508e6]	1962
	1963	rwabs8: cmp.w #1,8(a6) \| Check rwflag
[f40a309]	1964	ble rwabs9
[4f508e6]	1965
	1966	subq.w #2,8(a6) \| Adjust to 0\|1
	1967
	1968	rwabs9: move.w 14(a6),(a7) \| Setup count,
	1969	move.w d6,-(a7) \| ... drive,
	1970	move.w 16(a6),-(a7) \| ... recno,
	1971	move.l 10(a6),-(a7) \| ... buffer,
	1972	move.w 8(a6),-(a7) \| ... rwflag
	1973	bsr floprw \| Call floprw
	1974
	1975	add.l #10,a7 \| Cleanup stack
	1976
	1977	rwabser: tst.l (a7)+ \| Pop stack scratch
	1978	movem.l (a7)+,d5-d7/a5 \| Restore registers
	1979	unlk a6 \| Release temporaries
	1980	rts \| Return to caller
	1981
	1982	.page
	1983
	1984	\| floprw -- Floppy read / write driver
	1985	\| ------ --------------------------
	1986	floprw: link a6,#-6 \| Reserve space for temps
	1987	movem.l d2-d7/a5,-(a7) \| Save registers
	1988	move.w 16(a6),d0 \| Drive number to d0
	1989	asl.w #5,d0 \| Shift ( \|32 )
	1990	ext.l d0 \| Sign extend it, too
	1991	move.l d0,a5 \| Result in a5
	1992	add.l #drvbpbs,a5 \| Add base of BPB table
	1993	btst #0,13(a6) \| Buffer address even ?
	1994	bne floprw01 \| Jump if not
	1995
	1996	clr.w d0 \| Clear odd flag
	1997	bra floprw02 \| Go save the flag
	1998
	1999	floprw01: moveq.l #1,d0 \| Set odd flag
	2000
	2001	floprw02: move.w d0,-2(a6) \| Save it
	2002	tst.w 22(a5) \| dspc set ?
	2003	bne floprw20 \| Jump if so
	2004
	2005	moveq.l #9,d0 \| Assume 9
	2006	move.w d0,22(a5) \| ... and make it the default
	2007	move.w d0,24(a5) \| ... for dspt and dspc
	2008
[f40a309]	2009	floprw20: bra floprw18
[4f508e6]	2010
	2011	floprw03: tst.w -2(a6) \| Is odd flag set ?
	2012	beq floprw04 \| Jump if not
	2013
	2014	move.l #buffer,d0 \| Point to sector buffer
[f40a309]	2015	bra floprw05
[4f508e6]	2016
	2017	floprw04: move.l 10(a6),d0 \| Get buffer address
	2018
	2019	floprw05: move.l d0,-6(a6) \| ... and save
	2020	move.w 14(a6),d6 \| Get recno (lsn)
	2021	ext.l d6 \| Extend it to long
	2022	divs.w 22(a5),d6 \| Divide by dspc for track #
	2023	move.w 14(a6),d4 \| Get recno
	2024	ext.l d4 \| Extend to long
	2025	divs.w 22(a5),d4 \| Divide by dspc
	2026	swap d4 \| Use remainder as sector number
	2027	cmp.w 24(a5),d4 \| Compare with dspt
	2028	bge floprw06 \| Greater than or equal ?
	2029
	2030	clr.l d5 \| Use side 0
[f40a309]	2031	bra floprw07
[4f508e6]	2032
	2033	floprw06: moveq.l #1,d5 \| Use side 1
	2034	sub.w 24(a5),d4 \| Subtract dspt from sector #
	2035
	2036	.page
	2037
	2038	floprw07: tst.w -2(a6) \| Is odd flag set ?
	2039	beq floprw08 \| Jump if not
	2040
	2041	moveq.l #1,d3 \| Set counter to 1
[f40a309]	2042	bra floprw10
[4f508e6]	2043
	2044	floprw08: move.w 24(a5),d0 \| Get dspt
	2045	sub.w d4,d0 \| Subtract sector number
	2046	cmp.w 18(a6),d0 \| Compare with number of sectors
	2047	bge floprw09 \| Jump if greater than or eq to
	2048
	2049	move.w 24(a5),d3 \| Get dspt
	2050	sub.w d4,d3 \| Subtract sector number
[f40a309]	2051	bra floprw10
[4f508e6]	2052
	2053	floprw09: move.w 18(a6),d3 \| Count = number of sectors
	2054
	2055	floprw10: addq.w #1,d4 \| Adjust sector number (1 org)
	2056
	2057	floprw11: tst.w 8(a6) \| Test r/w flag
	2058	beq floprw14 \| Jump if it's a read
	2059
	2060	move.l -6(a6),d0 \| Get buffer pointer
	2061	cmp.l 10(a6),d0 \| See if it's = buffer addr
	2062	beq floprw12 \| Jump if so
	2063
	2064	move.l -6(a6),(a7) \| Get source address
	2065	move.l 10(a6),-(a7) \| Destination address
	2066	jsr fastcopy \| Copy the sector
	2067	addq.l #4,a7 \| Cleanup stack
	2068
	2069	floprw12: move.w d3,(a7) \| Number of sectors
	2070	move.w d5,-(a7) \| Side number
	2071	move.w d6,-(a7) \| Track number
	2072	move.w d4,-(a7) \| Sector number
	2073	move.w 16(a6),-(a7) \| Drive number
	2074	clr.l -(a7) \| Filler
	2075	move.l -6(a6),-(a7) \| Buffer address
	2076	jsr flopwr \| Write sector
	2077	add.l #16,a7 \| Cleaup stack
	2078	move.l d0,d7 \| Save error code in d7
	2079	tst.l d7 \| Errors ?
	2080	bne floprw13 \| Jump if so
	2081
	2082	.page
	2083
	2084	tst.w fverify \| Verify after write ?
	2085	beq floprw13 \| Jump if not
	2086
	2087	move.w d3,(a7) \| Number of sectors
	2088	move.w d5,-(a7) \| Side number
	2089	move.w d6,-(a7) \| Track number
	2090	move.w d4,-(a7) \| Sector number
	2091	move.w 16(a6),-(a7) \| Drive number
	2092	clr.l -(a7) \| Filler
	2093	move.l #buffer,-(a7) \| Buffer address
	2094	jsr flopver \| Verify sector(s)
	2095	add.l #16,a7 \| Cleanup stack
	2096	move.l d0,d7 \| Save error code in d7
	2097	tst.l d7 \| Errors ?
	2098	bne floprw13 \| Jump if so
	2099
	2100	move.l #buffer,(a7) \| Address of sector buffer
	2101	bsr itom \| Convert first word of buffer
	2102	tst.w d0 \| Bad sectors ?
	2103	beq floprw13 \| Jump if not
	2104
	2105	moveq.l #ERR16,d7 \| ERROR -- "Bad sectors"
	2106
[f40a309]	2107	floprw13: bra floprw15
[4f508e6]	2108
	2109	.page
	2110
	2111	floprw14: move.w d3,(a7) \| Number of sectors
	2112	move.w d5,-(a7) \| Side number
	2113	move.w d6,-(a7) \| Track number
	2114	move.w d4,-(a7) \| Sector number
	2115	move.w 16(a6),-(a7) \| Drive number
	2116	clr.l -(a7) \| Filler
	2117	move.l -6(a6),-(a7) \| Sector buffer
	2118	jsr floprd \| Read floppy sector(s)
	2119	add.l #16,a7 \| Cleanup stack
	2120	move.l d0,d7 \| Save error code in d7
	2121	move.l -6(a6),d0 \| User buffer address
	2122	cmp.l 10(a6),d0 \| Is it the desired buffer ?
	2123	beq floprw15 \| Jump if so
	2124
	2125	move.l 10(a6),(a7) \| Push source address
	2126	move.l -6(a6),-(a7) \| Push destination address
	2127	jsr fastcopy \| Copy the sector
	2128	addq.l #4,a7 \| Cleanup stack
	2129
	2130	floprw15: tst.l d7 \| Error code set ?
	2131	bge floprw16 \| Jump if not
	2132
	2133	move.w 16(a6),(a7) \| Push drive number
	2134	move.l d7,d0 \| Error code
	2135	move.w d0,-(a7) \| ... onto stack
	2136	jsr criter \| Call critical error handler
	2137	addq.l #2,a7 \| Cleanup stack
	2138	move.l d0,d7 \| Get error code
	2139
	2140	floprw16: cmp.l #RETRYIT,d7 \| Re-try ?
	2141	beq floprw11 \| Jump if so
	2142
	2143	tst.l d7 \| Check error code
	2144	bge floprw17 \| Jump if no error
	2145
	2146	move.l d7,d0 \| Error code is the result
[f40a309]	2147	bra floprw19
[4f508e6]	2148
	2149	.page
	2150
	2151	floprw17: move.w d3,d0 \| Sector counter to d0
	2152	ext.l d0 \| Sign extend
	2153	moveq.l #9,d1 \| Times 512
	2154	asl.l d1,d0 \| ...
	2155	add.l d0,10(a6) \| Update buffer address
	2156	add.w d3,14(a6) \| Update sector number
	2157	sub.w d3,18(a6) \| Update sector count
	2158
	2159	floprw18: tst.w 18(a6) \| More sectors ?
	2160	bne floprw03 \| Jump if so
	2161
	2162	clr.l d0 \| Set "no error" as result
	2163
	2164	floprw19: tst.l (a7)+ \| Test top of stack
	2165	movem.l (a7)+,d3-d7/a5 \| Restore registers
	2166	unlk a6 \| Release stack space
	2167	rts \| Return to caller
	2168
	2169	.page
	2170
	2171	\| itom -- Convert 8086 integer format to 680000 integer format
	2172	\| ---- ----------------------------------------------------
	2173	itom: link a6,#-4 \| Reserve stack for temps
	2174	move.l 8(a6),a0 \| Address of the number to a0
	2175	move.b 1(a0),d0 \| Get high byte
	2176	ext.w d0 \| Make it a word
	2177	and.w #0xFF,d0 \| Isolate bits 0..7
	2178	asl.w #8,d0 \| Shift in bits 8..15
	2179	move.l 8(a6),a1 \| Address of the number to a1
	2180	move.b (a1),d1 \| Get low byte
	2181	ext.w d1 \| Extend to word
	2182	and.w #0xFF,d1 \| Isolate bits 0..7
	2183	or.w d1,d0 \| Combine with bits 8..15
	2184	unlk a6 \| Release stack space
	2185	rts \| Return to caller
	2186
	2187	.page
	2188
	2189	\| flopini -- Initialize floppy drive
	2190	\| ------- -----------------------
	2191	flopini: lea dsb0,a1 \| Point to dsb for drive A
	2192	tst.w 12(a7) \| Drive A wanted ?
	2193	beq flopin01 \| Jump if so
	2194
	2195	lea dsb1,a1 \| Drive B dsb address to a1
	2196
	2197	flopin01: move.w seekrate,2(a1) \| Get seek rate
	2198	moveq.l #ERR01,d0 \| Set default error number
	2199	clr.w 0(a1) \| Set track number to 0
	2200	bsr floplock \| Setup floppy parameters
	2201	bsr select \| Select drive and side
	2202	move.w #0xFF00,0(a1)
	2203	bsr restore \| Restore the drive
[f40a309]	2204	moveq.l #6,d7
	2205	bsr hseek1
	2206	bne flopin02
[4f508e6]	2207
	2208	bsr restore \| Restore the drive
	2209	beq flopok \| Jump if no error
	2210
	2211	flopin02: bra flopfail \| Jump to error handler
	2212
	2213	.page
	2214
	2215	\| floprd -- Read floppy
	2216	\| ------ -----------
	2217	floprd: bsr change \| Disk changed ?
	2218	moveq.l #ERR11,d0 \| Set to "read error"
	2219	bsr floplock \| Set parameters
	2220
	2221	floprd01: bsr select \| Select drive and side
	2222	bsr go2track \| Position on track
	2223	bne floprd02 \| Try again on error
	2224
	2225	move.w #ERR01,deferr \| Set default error
	2226	move.l edma(a5),a0 \| Get final DMA address
	2227	move.l cdma(a5),a2 \| Get first DMA address
	2228	move.l #0x40000,d7 \| Set timeout counter
	2229	move.b #FL_RM,DSKCMD(a6) \| Start readng the disk
	2230
	2231	floprd03: btst #0,DSKCMD(a6) \| Disk busy yet ?
	2232	bne floprd05 \| Jump if so
	2233
	2234	subq.l #1,d7 \| Decrement timeout counter
	2235	beq floprd04 \| Jump if timed out
	2236
	2237	bra floprd03 \| Go try for busy again
	2238
	2239	floprd05: move.l #0x40000,d7 \| Reset timeout counter
	2240	bra floprd09 \| Go join main read loop
	2241
	2242	floprd07: subq.l #1,d7 \| Decrement timeout counter
	2243	beq floprd04 \| Jump if timed out
	2244
	2245	btst #0,DSKCMD(a6) \| Done yet ?
	2246	beq floprd08 \| Jump if so
	2247
	2248	floprd09: btst #1,DSKCMD(a6) \| DRQ set ?
	2249	beq floprd07 \| Jump if not
	2250
	2251	move.b DSKDAT(a6),(a2)+ \| Read the byte into the buffer
	2252	cmp.l a0,a2 \| Done reading ?
	2253	bne floprd07 \| Jump if not
	2254
	2255	.page
	2256
	2257	floprd08: move.b DSKCMD(a6),d0 \| Read final status into d0
	2258	and.b #0x1C,d0 \| Mask for error bits
	2259	beq flopok \| Jump if no errors
	2260
	2261	bsr errbits \| Determine error code
	2262
	2263	floprd02: cmp.w #1,retrycnt(a5) \| Re-try ?
	2264	bne floprd06 \| Jump if not
	2265
	2266	bsr reseek \| Home and repeat the seek
	2267
	2268	floprd06: subq.w #1,retrycnt(a5) \| Update re-try count
	2269	bpl floprd01 \| Re-try if count still >0
	2270
	2271	bra flopfail \| Failure
	2272
	2273	floprd04: move.w #ERR02,curerr(a5) \| Set error code "not ready"
	2274	bsr rs1772 \| Reset the WD1772
	2275	bra floprd02 \| See if it can be retried
	2276
	2277	.page
	2278
	2279	\| errbits -- Develop error code for floppy I/O error
	2280	\| ------- ---------------------------------------
	2281	errbits: moveq.l #ERR13,d1 \| Write protect ?
	2282	btst #6,d0 \| ...
	2283	bne errbits1 \| Jump if so
	2284
	2285	moveq.l #ERR08,d1 \| Record not found ?
	2286	btst #4,d0 \| ...
	2287	bne errbits1 \| Jump if so
	2288
	2289	moveq.l #ERR04,d1 \| CRC error ?
	2290	btst #3,d0 \| ...
	2291	bne errbits1 \| Jump if so
	2292
	2293	moveq.l #ERR12,d1 \| Lost data ?
	2294	btst #2,d0 \| ...
	2295	bne errbits1 \| Jump if so
	2296
	2297	move.w deferr(a5),d1 \| Use default error
	2298
	2299	errbits1: move.w d1,curerr(a5) \| ... as curerr
	2300	rts \| Return to caller
	2301
	2302	.page
	2303
	2304	\| flopwr -- Floppy write
	2305	\| ------ ------------
	2306	flopwr: bsr change \| Check for disk change
	2307	moveq.l #ERR10,d0 \| Set write error
	2308	bsr floplock \| Set parameters
	2309	move.w csect(a5),d0 \| Get sector number in d0
	2310	subq.w #1,d0 \| ... -1
	2311	or.w ctrack(a5),d0 \| OR with track number
	2312	or.w cside(a5),d0 \| OR with side number
	2313	bne flopwr01 \| Jump if not boot sector
	2314
	2315	moveq.l #2,d0 \| Media change
	2316	bsr setdmode \| Set to "unsure"
	2317
	2318	flopwr01: bsr select \| Select drive and side
	2319	bsr go2track \| Seek
	2320	bne flopwr06 \| Re-try on error
	2321
	2322	flopwr02: move.w #ERR01,curerr(a5) \| Set for default error
	2323	move.l cdma(a5),a2 \| Get I/O address
	2324	move.l #0x40000,d7 \| Set timeout counter
	2325	move.w ctrack(a5),d0 \| Get track number
	2326	cmpi.w #40,d0 \| See if we need precomp
	2327	bcs flopwr10 \| Jump if not
	2328
	2329	move.b #FL_WS,DSKCMD(a6) \| Write with precomp
	2330	bra flopwr08 \| Go join main write loop
	2331
	2332	flopwr10: move.b #FL_WS+FL_NC,DSKCMD(a6) \| Write (no precomp)
	2333
	2334	.page
	2335
	2336	flopwr08: btst #0,DSKCMD(a6) \| Busy yet ?
	2337	bne flopwr09 \| Jump if so
	2338
	2339	subq.l #1,d7 \| Decrement tiemout count
	2340	bne flopwr08 \| Jump if not timed out
	2341
	2342	flopwr13: bsr rs1772 \| Reset WD1772
	2343	bra flopwr05 \| See if we can retry
	2344
	2345	flopwr11: btst #0,DSKCMD(a6) \| Done ?
	2346	beq flopwr04 \| Jump if so
	2347
	2348	flopwr09: btst #1,DSKCMD(a6) \| DRQ set ?
	2349	bne flopwr12 \| Jump if so
	2350
	2351	subq.l #1,d7 \| Decrement timeout counter
	2352	beq flopwr13 \| Jump if timed out
	2353
	2354	bra flopwr11 \| Jump if not
	2355
	2356	flopwr12: move.b (a2)+,DSKDAT(a6) \| Write byte to floppy
	2357	bra flopwr11 \| Go get the next one
	2358
	2359	.page
	2360
	2361	flopwr04: move.b DSKCMD(a6),d0 \| Get floppy status
	2362	bsr errbits \| Set error code
	2363	btst #6,d0 \| Write protect error ?
	2364	bne flopfail \| Fail if so
	2365
	2366	and.b #0x5C,d0 \| Mask error bits
	2367	bne flopwr05 \| Jump if an error occurred
	2368
	2369	addq.w #1,csect(a5) \| Update sector number
	2370	add.l #512,cdma(a5) \| Update DMA address
	2371	subq.w #1,ccount(a5) \| Decrement sector count
	2372	beq flopok \| Jump if zero -- done
	2373
	2374	bsr select1 \| Set sector and DMA pointer
	2375	bra flopwr02 \| Write next sector
	2376
	2377	flopwr05: cmp.w #1,retrycnt(a5) \| Second re-try ?
	2378	bne flopwr07 \| Jump if not
	2379
	2380	flopwr06: bsr reseek \| Restore and re-seek
	2381
	2382	flopwr07: subq.w #1,retrycnt(a5) \| Update re-try count
	2383	bpl flopwr01 \| Re-try if still >0
	2384
	2385	bra flopfail \| ... else fail
	2386
	2387	.page
	2388
	2389	\| flopfmt -- Format a track on the floppy
	2390	\| ------- ----------------------------
	2391	flopfmt: cmp.l #FMAGIC,22(a7) \| Is the magic right ?
	2392	bne flopfail \| Fail immediately if not
	2393
	2394	bsr change \| Check for disk change
	2395	moveq.l #ERR01,d0 \| Set default error number
	2396	bsr floplock \| Set parameters
	2397	bsr select \| Select drive and side
	2398	move.w 14(a7),spt(a5) \| Set sectors per track,
	2399	move.w 20(a7),interlv(a5) \| ... interleave,
	2400	move.w 26(a7),virgin(a5) \| ... initial data,
	2401	moveq.l #2,d0 \| Disk changed
	2402	bsr setdmode \| ...
	2403	bsr hseek \| Seek
	2404	bne flopfail \| Fail if seek error occurs
	2405
	2406	move.w ctrack(a5),0(a1) \| Current track to DSB
	2407	move.w #ERR01,curerr(a5) \| Default to curerr
	2408	bsr fmtrack \| Format the track
	2409	bne flopfail \| Fail if error occurs
	2410
	2411	move.w spt(a5),ccount(a5) \| Use spt as ccount
	2412	move.w #1,csect(a5) \| Start with sector 1
	2413	bsr verify1 \| Verify the sector
	2414	move.l cdma(a5),a2 \| Get bad sector list
	2415	tst.w (a2) \| Any bad ones ?
	2416	beq flopok \| Jump if not
	2417
	2418	move.w #ERR16,curerr(a5) \| ERROR -- "bad sectors"
[f40a309]	2419	bra flopfail
[4f508e6]	2420
	2421	.page
	2422
	2423	\| fmtrack -- Do the dirty work of formatting a track
	2424	\| ------- ---------------------------------------
	2425	fmtrack: move.w #ERR10,deferr(a5) \| Set default error number
	2426	move.w #1,d3 \| Start with sector 1
	2427	move.l cdma(a5),a2 \| Get track buffer address
	2428	move.w #60-1,d1 \| Set count = 60
	2429	move.b #0x4E,d0 \| Write 0x4E as initial gap
	2430	bsr wmult \| ...
	2431
	2432	fmtrak01: move.w d3,d4 \| Save sector number in d4
	2433
	2434	fmtrak02: move.w #12-1,d1 \| Set count = 12
	2435	clr.b d0 \| Write 0x00 as sync
	2436	bsr wmult \| ...
	2437	move.w #3-1,d1 \| Set count = 3
	2438	move.b #0xF5,d0 \| Write 0xF5's
	2439	bsr wmult \| ...
	2440	move.b #0xFE,(a2)+ \| Write 0xFE (address mark)
	2441	move.b ctrack+1,(a2)+ \| Write track #
	2442	move.b cside+1,(a2)+ \| Write side #
	2443	move.b d4,(a2)+ \| Write sector #
	2444	move.b #2,(a2)+ \| Write sector size code
	2445	move.b #0xF7,(a2)+ \| Write checksum code
	2446	move.w #22-1,d1 \| Set count = 22
	2447	move.b #0x4E,d0 \| Write gap
	2448	bsr wmult \| ...
	2449	move.w #12-1,d1 \| Set count = 12
	2450	clr.b d0 \| Write 0x00 as sync
	2451	bsr wmult \| ...
	2452	move.w #3-1,d1 \| Set count = 3
	2453	move.b #0xF5,d0 \| Write 0xF5's
	2454	bsr wmult \| ...
	2455	move.b #0xFB,(a2)+ \| Write DAM
	2456	move.w #256-1,d1 \| Set count = 256 words
	2457
	2458	.page
	2459
	2460	fmtrak03: move.b virgin(a5),(a2)+ \| Write virgin data in buffer
	2461	move.b virgin+1(a5),(a2)+ \| ...
	2462	dbf d1,fmtrak03 \| ...
	2463
	2464	move.b #0xF7,(a2)+ \| Write CRC code
	2465	move.w #40-1,d1 \| Set count = 40
	2466	move.b #0x4E,d0 \| Write gap
	2467	bsr wmult \| ...
	2468	add.w interlv(a5),d4 \| Add interleave to sector #
	2469	cmp.w spt(a5),d4 \| Check against spt
	2470	ble fmtrak02 \| Jump if not >
	2471
	2472	addq.w #1,d3 \| Starting sector +1
[f40a309]	2473	cmp.w interlv(a5),d3
	2474	ble fmtrak01
[4f508e6]	2475
	2476	move.w #1401-1,d1 \| Set count = 1401
	2477	move.b #0x4E,d0 \| Write final gap
	2478	bsr wmult \| ...
	2479	move.l cdma(a5),a2 \| Get buffer address
	2480	move.l #0x40000,d7 \| Set timeout count
	2481	move.w ctrack(a5),d0 \| Get track number
	2482	cmpi.w #40,d0 \| Do we need precomp ?
	2483	bcs fmtrak08 \| Jump if not
	2484
	2485	move.b #FL_WT,DSKCMD(a6) \| Start format with precomp
	2486	bra fmtrak07 \| Go join main format loop
	2487
	2488	fmtrak08: move.b #FL_WT+FL_NC,DSKCMD(a6) \| Start format without precomp
	2489
	2490	.page
	2491
	2492	fmtrak07: btst #0,DSKCMD(a6) \| Busy yet ?
	2493	bne fmtrak09 \| Jump if so
	2494
	2495	fmtrak04: subq.l #1,d7 \| Decrement timeout counter
	2496	bne fmtrak07 \| Jump if not timed out
	2497
	2498	fmtrak05: bsr rs1772 \| Reset WD1772
	2499	moveq.l #1,d7 \| Set error flag
	2500	rts \| Return to caller
	2501
	2502	fmtrak11: btst #0,DSKCMD(a6) \| Done ?
	2503	beq fmtrak06 \| Jump if so
	2504
	2505	fmtrak09: btst #1,DSKCMD(a6) \| DRQ set ?
	2506	bne fmtrak10 \| Jump if so
	2507
	2508	subq.l #1,d7 \| Decrement timeout coutner
	2509	beq fmtrak05 \| Jump if timed out
	2510
	2511	bra fmtrak11 \| Go check again
	2512
	2513	fmtrak10: move.b (a2)+,DSKDAT(a6) \| Write a byte of format
	2514	bra fmtrak11 \| Go wait for DRQ
	2515
	2516	fmtrak06: move.b DSKCMD(a6),d0 \| Get final status
	2517	bsr errbits \| Set possible error code
	2518	andi.b #0x44,d0 \| Check error bits
	2519	rts \| Return to caller with status
	2520
	2521	\| wmult -- write multiple bytes into the track buffer
	2522	\| ----- ------------------------------------------
	2523	wmult: move.b d0,(a2)+ \| Move a byte into the buffer
	2524	dbf d1,wmult \| Loop until we're done
	2525
	2526	rts \| Return to caller
	2527
	2528	.page
	2529
	2530	\| flopver -- verify sector(s) on a floppy
	2531	\| ------- ----------------------------
	2532	flopver: bsr change \| Check for disk change
	2533	moveq.l #ERR11,d0 \| Set default to "read error"
	2534	bsr floplock \| Set parameters
	2535	bsr select \| Select drive and side
	2536	bsr go2track \| Seek
	2537	bne flopfail \| Jump if seek error
	2538
	2539	bsr verify1 \| Verify the data
	2540	bra flopok \| Done
	2541
	2542	\| verify1 -- Verify the data for a sector
	2543	\| ------- ----------------------------
	2544	verify1: move.w #ERR11,deferr(a5) \| Set default = "read error"
	2545	move.l cdma(a5),a2 \| Pointer for bad sector list
	2546	add.l #512,cdma(a5) \| Update by length of a sector
	2547
	2548	verify01: move.w #2,retrycnt(a5) \| Set retrycnt for 2 attempts
	2549	move.w csect(a5),d7 \| Get sector nubmer
	2550	move.b d7,DSKSEC(a6) \| Send to WD1772
	2551
	2552	verify02: moveq.l #0,d6 \| Clear bad compare flag
	2553	move.l cdma(a5),a0 \| Get compare address
	2554	move.l #0x40000,d7 \| Set timeout counter
	2555	move.b #FL_RS,DSKCMD(a6) \| Start the read
	2556
	2557	verify08: btst #0,DSKCMD(a6) \| Busy yet ?
	2558	bne verify09 \| Jump if so
	2559
	2560	subq.l #1,d7 \| Decrement timeout counter
	2561	beq verify13 \| Jump if timed out
	2562
	2563	bra verify08 \| Wait for busy some more
	2564
	2565	verify09: move.l #0x40000,d7 \| Reset timeout counter
	2566	bra verify11 \| Go join main compare loop
	2567
	2568	verify10: subq.l #1,d7 \| Decrement timeout counter
	2569	beq verify13 \| Jump if timed out
	2570
	2571	btst #0,DSKCMD(a6) \| Done yet ?
	2572	beq verify12 \| Jump if so
	2573
	2574	.page
	2575
	2576	verify11: btst #1,DSKCMD(a6) \| DRQ set ?
	2577	beq verify10 \| Jump if not
	2578
	2579	move.b DSKDAT(a6),d0 \| Read data
	2580	bra verify10 \| Continue reading
	2581
	2582	verify12: move.b DSKCMD(a6),d0 \| Get final status
	2583	bsr errbits \| Determine error code
	2584	and.b #0x1C,d0 \| Mask RNF, CRC, LOST
	2585	bne verify06 \| Jump to re-try if any set
	2586
	2587	verify05: addq.w #1,csect(a5) \| Update sector number
	2588	subq.w #1,ccount(a5) \| Update sector count
	2589	bne verify01 \| Jump if more to do
	2590
	2591	sub.l #512,cdma(a5) \| Reset DMA pointer
	2592	clr.w (a2) \| Set NIL in bad sector list
	2593	rts \| Return to caller
	2594
	2595	verify06: cmp.w #1,retrycnt(a5) \| Is it the 2nd attempt ?
	2596	bne verify07 \| Jump if not
	2597
	2598	bsr reseek \| Restore and re-seek
	2599
	2600	verify07: subq.w #1,retrycnt(a5) \| Decrement retry count
	2601	bpl verify02 \| Re-try if still positive
	2602
	2603	move.w csect(a5),(a2)+ \| Add to bad sector list
	2604	bra verify05 \| Go do next sector
	2605
	2606	verify13: move.w #ERR02,curerr(a5) \| Set timeout error code
	2607	bsr rs1772 \| Reset WD1772
	2608	bra verify06 \| See if we can retry it
	2609
	2610	.page
	2611
	2612	\| flopvbl -- Floppy VBL timer interrupt handling
	2613	\| ------- -----------------------------------
	2614	flopvbl: movem.l d0-d1/a0-a1/a5-a6,-(a7) \| Save registers
	2615	sub.l a5,a5 \| Clear a5 for use as RAM base
	2616	lea FLOPPY,a6 \| Base of floppy regs
	2617	st motoron(a5) \| Set motoron flag
	2618	move.l frclock(a5),d0 \| Get interrupt count
	2619	move.b d0,d1 \| ...
	2620	and.b #7,d1 \| ... MOD 8
	2621	bne flopvb02 \| Jump if not 8th int
	2622
	2623	move.w sr,-(a7) \| Save interrupt level
	2624	ori.w #IPL7,sr \| Mask off interrupts
	2625	clr.w deslflag(a5) \| Clear deselect flag
	2626	move.b mc1iorec+cfr1,d0 \| Get port status
	2627	ori.b #1,d0 \| Set drive select bit
	2628	move.b d0,MC1ACIA+ACIA_CFR \| Send drive select to port
	2629	move.b d0,mc1iorec+cfr1 \| Store updated port status
	2630	move.w (a7)+,sr \| Restore interrupt level
	2631	lea wpstatus(a5),a0 \| Point at wpstatus for drive
	2632	lea dsb0(a5),a1 \| Point at dsb0
	2633	move.b DSKCMD(a6),d0 \| Read WD1772 status
	2634	btst #6,d0 \| Test write protect bit
	2635	sne (a0) \| ... and save
	2636
	2637	.page
	2638
	2639	flopvb02: move.w wpstatus(a5),d0 \| Get wpstatus of drive A
	2640	or.w d0,wplatch(a5) \| OR into wplatch
	2641	tst.w deslflag(a5) \| Floppies already deselected ?
	2642	bne flopvb03 \| Jump if so
	2643
	2644	move.b DSKCMD(a6),d0 \| Read WD1772 status
	2645	btst #7,d0 \| Motor-on bit set ?
	2646	bne flopvb04 \| Don't de-select if it is
	2647
	2648	move.w sr,-(a7) \| Save sr
	2649	ori.w #IPL7,sr \| Disable interrupts
	2650	move.b mc1iorec+cfr1,d0 \| Get cfr1 image
	2651	bclr #0,d0 \| Clear d0 (drive select)
	2652	move.b d0,mc1iorec+cfr1 \| Save new value
	2653	move.b d0,MC1ACIA+ACIA_CFR \| Send to hardware
	2654	move.w (a7)+,sr \| Restore sr (enable ints)
	2655	move.w #1,deslflag(a5) \| Set the deselect flag
	2656
	2657	flopvb03: clr.w motoron(a5) \| Clear motoron flag
	2658
	2659	flopvb04: movem.l (a7)+,d0-d1/a0-a1/a5-a6 \| Restore registers
	2660	rts \| Return to caller
	2661
	2662	.page
	2663
	2664	\| floplock -- Setup floppy parameters
	2665	\| -------- -----------------------
	2666	floplock: movem.l d3-d7/a3-a6,flpregs \| Save registers
	2667	move.w sr,flpsrsv \| Save sr
	2668	ori.w #IPL7,sr \| Disable ints
	2669	sub.l a5,a5 \| Clear a5
	2670	lea FLOPPY,a6 \| Base of floppy registers
	2671	st motoron(a5) \| Set motoron flag
	2672	move.w d0,deferr(a5) \| Set default error code
	2673	move.w d0,curerr(a5) \| ... current error code
	2674	move.w #1,flock(a5) \| Disable flopvbl routine
	2675	move.l 8(a7),cdma(a5) \| Set cdma
	2676	move.w 16(a7),cdev(a5) \| ... cdev
	2677	move.w 18(a7),csect(a5) \| ... csect
	2678	move.w 20(a7),ctrack(a5) \| ... ctrack
	2679	move.w 22(a7),cside(a5) \| ... cside
	2680	move.w 24(a7),ccount(a5) \| ... ccount
	2681	move.w #2,retrycnt(a5) \| ... retrycnt
	2682	lea dsb0(a5),a1 \| Address of dsb0
	2683	tst.w cdev(a5) \| Drive A ?
	2684	beq floplk01 \| Jump if so
	2685
	2686	lea dsb1(a5),a1 \| Drive B, use dsb1
	2687
	2688	floplk01: moveq.l #0,d7 \| Clear out d7
	2689	move.w ccount(a5),d7 \| Get ccount
	2690	lsl.w #8,d7 \| ... \| sector length (512)
	2691	lsl.w #1,d7 \| ...
	2692	move.l cdma(a5),a0 \| Get DMA start address
	2693	add.l d7,a0 \| Add length of sectors
	2694	move.l a0,edma(a5) \| Set edma (end DMA address)
	2695	tst.w 0(a1) \| Check current track
	2696	bpl floplk03 \| Jump if >= 0
	2697
	2698	bsr select \| Select the drive
	2699	clr.w 0(a1) \| Set current track to 0
	2700	bsr restore \| Restore drive to track 0
	2701	beq floplk03 \| Jump if OK
	2702
	2703	moveq.l #10,d7 \| Seek out to track 10
	2704	bsr hseek1 \| ...
	2705	bne floplk02 \| Jump if an error occurred
	2706
	2707	bsr restore \| Try the restore again
	2708	beq floplk03 \| Jump if OK
	2709
	2710	floplk02: move.w #0xFF00,0(a1) \| Recalibrate error
	2711
	2712	floplk03: rts \| Return to caller
	2713
	2714	.page
	2715
	2716	\| flopfail -- Floppy I/O failure exit
	2717	\| -------- -----------------------
	2718	flopfail: moveq.l #1,d0 \| Set media change to "unsure"
	2719	bsr setdmode \| ...
	2720	move.w curerr(a5),d0 \| Get curerr
	2721	ext.l d0 \| ...
	2722	bra flopok1 \| Go set end status
	2723
	2724	\| flopok -- Floppy I/O success exit
	2725	\| ------ -----------------------
	2726	flopok: clr.l d0 \| Set error code = 0 (no error)
	2727
	2728	flopok1: move.l d0,-(a7) \| Push code onto stack
	2729	move.w 0(a1),d7 \| Get track number
	2730	move.b d7,DSKDAT(a6) \| Send to WD1772
	2731	move.w #FL_SK,d6 \| Seek command to d6
	2732	bsr flopcmds \| Send command
	2733	move.w cdev(a5),d0 \| Get drive number
	2734	lsl.w #2,d0 \| Use as index
	2735	lea acctim(a5),a0 \| ... into acctim
	2736	move.l _hz_200(a5),0(a0,d0) \| Set last access time
[f40a309]	2737	cmp.w #1,nflops(a5)
	2738	bne flopok01
[4f508e6]	2739
	2740	move.l _hz_200(a5),4(a0) \| Time for other drive
	2741
	2742	flopok01: move.w flpsrsv,sr \| Restore sr (enable ints)
	2743	move.l (a7)+,d0 \| Restore error number to d0
	2744	movem.l flpregs,d3-d7/a3-a6 \| Restore registers
	2745	clr.w flock \| Release flopvbl routine
	2746	rts \| Return to caller
	2747
	2748	.page
	2749
	2750	\| hseek -- seek to track in ctrack
	2751	\| ----- -----------------------
	2752	hseek: move.w ctrack,d7 \| Get ctrack
	2753
	2754	\| hseek1 -- seek to track in d7
	2755	\| ------ -------------------
	2756	hseek1: move.w #ERR10,curerr \| Set curerr = "seek error"
	2757	move.b d7,DSKDAT(a6) \| Send track number to WD1772
	2758	move.w #FL_SK,d6 \| Seek command
	2759	bra flopcmds \| Go send command to WD1772
	2760
	2761	\| reseek -- Restore, then re-seek
	2762	\| ------ ---------------------
	2763	reseek: move.w #ERR10,curerr \| Set curerr = "seek error"
	2764	bsr restore \| Restore
	2765	bne reseek01 \| Jump if error occurred
	2766
	2767	clr.w 0(a1) \| Clear current track to 0
	2768	move.b #0,DSKTRK(a6) \| Send track to WD1772
	2769	move.b #5,DSKDAT(a6) \| Setup to seek to track 5
	2770	move.w #FL_SK,d6 \| Seek command
	2771	bsr flopcmds \| Seek
	2772	bne reseek01 \| Jump if error
	2773
	2774	move.w #5,0(a1) \| Update current track = 5
	2775
	2776	\| go2track -- seek with verify
	2777	\| -------- ----------------
	2778	go2track: move.w #ERR10,curerr(a5) \| Set curerr = "seek error"
	2779	move.w ctrack(a5),d7 \| Put track # in d7
	2780	move.b d7,DSKDAT(a6) \| Send track to WD1772
	2781	moveq.l #FL_SV,d6 \| Seek/verify command
	2782	bsr flopcmds \| Send command to floppy
	2783	bne reseek01 \| Jump if error occurred
	2784
	2785	move.w ctrack(a5),0(a1) \| Update track number in dsb
	2786	and.b #0x18,d7 \| Test for RNF, CRC, LOST
	2787
	2788	reseek01: rts \| Return to caller
	2789
	2790	.page
	2791
	2792	\| restore -- Restore to track 0
	2793	\| ------- ------------------
	2794	restore: clr.w d6 \| Restore command
	2795	bsr flopcmds \| Send to WD1772
	2796	bne restor01 \| Jump if an error occurred
	2797
	2798	btst #2,d7 \| Check track 0 bit
	2799	eori #0004,sr \| Invert Z flag in 680000 sr
	2800	bne restor01 \| Jump if not track 0
	2801
	2802	clr.w 0(a1) \| Set track = 0 in dsb
	2803
	2804	restor01: rts \| Return to caller
	2805
	2806	\| flopcmds -- Send command to WD1772 floppy controller
	2807	\| -------- ----------------------------------------
	2808	flopcmds: move.w 2(a1),d0 \| Get seek rate from dsb
	2809	and.b #0x3,d0 \| ...
	2810	or.b d0,d6 \| OR into command word
	2811	move.l #0x40000,d7 \| Set timeout counter
	2812	btst #7,DSKCMD(a6) \| Motor on ?
	2813	bne flopcm01 \| Jump if so
	2814
	2815	move.l #0x60000,d7 \| Set longer timeout count
	2816
	2817	flopcm01: move.b d6,DSKCMD(a6) \| Write command from d6
	2818
	2819	move.l #0x1000,d0 \| Set initial busy timeout in d0
	2820
	2821	flopcm04: btst #0,DSKCMD(a6) \| Controller busy yet ?
	2822	bne flopcm02 \| Jump if so
	2823
	2824	subq.l #1,d0 \| Decrement timeout counter
	2825	beq flopcm03 \| Jump if timed out
	2826
	2827	bra flopcm04 \| Wait for busy some more
	2828
	2829	flopcm02: subq.l #1,d7 \| Decrement timeout counter
	2830	beq flopcm03 \| Jump if timed out
	2831
	2832	btst #0,DSKCMD(a6) \| WD1772 done ?
	2833	bne flopcm02 \| Jump if not
	2834
	2835	clr.l d7 \| Clear out upper bits of d7
	2836	move.b DSKCMD(a6),d7 \| Read status into LS byte of d7
	2837	clr.l d6 \| Clear error flag in d6
	2838	rts \| Return to caller
	2839
	2840	flopcm03: bsr rs1772 \| Reset WD1772 (end transfer)
	2841	moveq.l #1,d6 \| Set error flag in d6
	2842	rts \| Return to caller
	2843
	2844	.page
	2845
	2846	\| rs1772 -- Reset WD1772 floppy controller
	2847	\| ------ ------------------------------
	2848	rs1772: move.b #FL_FR,DSKCMD(a6) \| Send reset to WD1772
	2849	move.w #15,d7 \| Set delay count
	2850
	2851	rs1772a: dbf d7,rs1772a \| Delay a while
	2852	rts \| Return to caller
	2853
	2854	\| select -- Select drive and side
	2855	\| ------ ----------------------
	2856	select: move.w sr,-(a7) \| Save sr on stack
	2857	ori.w #IPL7,sr \| Disable interrupts
	2858	clr.w deslflag(a5) \| Clear deselect flag
	2859	move.b mc1iorec+cfr1,d0 \| Get current MC1 cfr1 image
	2860	ori.b #1,d0 \| Select drive (we only have 1)
	2861	move.b d0,mc1iorec+cfr1 \| Store updated image
	2862	move.b d0,MC1ACIA+ACIA_CFR \| Send it to the MC1 ACIA
	2863	move.w cside(a5),d0 \| Get side number (LS bit)
	2864	and.w #1,d0 \| Mask off garbage bits
	2865	andi.b #0xFE,mc2iorec+cfr1 \| Mask off D0 in MC2 cfr1 image
	2866	or.b mc2iorec+cfr1,d0 \| OR side with mc2iorec cfr1
	2867	move.b d0,mc2iorec+cfr1 \| Store updated cfr1 image
	2868	move.b d0,MC2ACIA+ACIA_CFR \| Send it to the MC2 ACIA
	2869	move.w (a7)+,sr \| Restore interrupts
	2870	move.w 0(a1),d7 \| Get track from dsb
	2871	move.b d7,DSKTRK(a6) \| Send it to the WD1772
	2872	clr.b tmpdma(a5) \| Clear bits 31..24 of tmpdma
	2873
	2874	select1: move.w csect(a5),d7 \| Get sector number
	2875	move.b d7,DSKSEC(a6) \| Send it to the WD1772
	2876	move.l cdma(a5),a0 \| Setup transfer address in a0
	2877	rts \| Return to caller
	2878
	2879	.page
	2880
	2881	\| change -- Check for disk change status
	2882	\| ------ ----------------------------
	2883	change: cmp.w #1,nflops \| Check # of floppies
[f40a309]	2884	bne change02
[4f508e6]	2885
	2886	move.w 16(a7),d0 \| Drive number to d0
[f40a309]	2887	cmp.w disknum,d0
[4f508e6]	2888	beq change01 \| Jump if =
	2889
	2890	move.w d0,-(a7) \| Stack drive number
	2891	move.w #ERR17,-(a7) \| Stack error code
	2892	bsr criter \| Do critical error routine
	2893	addq.w #4,a7 \| Cleanup stack
	2894	move.w #0xFFFF,wplatch \| Status for drives = "unsure"
	2895	move.w 16(a7),disknum \| Save disk number
	2896
	2897	change01: clr.w 16(a7) \| Clear disk number
	2898
	2899	change02: rts \| Return to caller
	2900
	2901	\| setdmode -- Set drive change mode
	2902	\| -------- ---------------------
	2903	setdmode: lea dskmode,a0 \| Point at disk mode table
	2904	move.b d0,-(a7) \| Save mode on stack
	2905	move.w cdev(a5),d0 \| Get drive number
	2906	move.b (a7)+,0(a0,d0) \| Set drive mode / cleanup stack
	2907	rts \| Return to caller
	2908
	2909	.page
	2910
	2911	\| bootload -- Load boot sector
	2912	\| -------- ----------------
	2913	bootload: link a6,#0 \| Link stack frames
	2914	movem.l d6-d7,-(a7) \| Save registers
	2915	jsr _hdvini \| Init drive
	2916	tst.w nflops \| See if any connected
	2917	beq bootld01 \| Jump if drive there
	2918
	2919	moveq.l #1,d0 \| "couldn't load"
[f40a309]	2920	bra bootld02
[4f508e6]	2921
	2922	bootld01: moveq.l #2,d0 \| "no drive connected"
	2923
	2924	bootld02: move.w d0,d7 \| Save possible error in d7
[f40a309]	2925	tst.w nflops
	2926	beq bootld04
[4f508e6]	2927
[f40a309]	2928	cmp.w #2,bootdev
	2929	bge bootld04
[4f508e6]	2930
	2931	move.w #1,(a7) \| Sector count = 1,
	2932	clr.w -(a7) \| ... side = 0,
	2933	clr.w -(a7) \| ... track = 0,
	2934	move.w #1,-(a7) \| ... sector = 1,
	2935	move.w bootdev,-(a7) \| ... drive = bootdev,
	2936	clr.l -(a7) \| ... filler,
	2937	move.l #buffer,-(a7) \| ... buffer address
	2938	jsr floprd \| Read the sector
	2939	add.l #16,a7 \| Cleanup stack
	2940	tst.l d0 \| Error ?
	2941	bne bootld03 \| Jump if not
	2942
[f40a309]	2943	clr.w d7
	2944	bra bootld04
[4f508e6]	2945
[f40a309]	2946	bootld03: tst.b wpstatus
	2947	bne bootld04
[4f508e6]	2948
	2949	moveq.l #3,d0 \| "unreadable"
[f40a309]	2950	bra bootld07
[4f508e6]	2951
[f40a309]	2952	bootld04: tst.w d7
	2953	beq bootld05
[4f508e6]	2954
	2955	move.w d7,d0 \| Get old error code
[f40a309]	2956	bra bootld07
[4f508e6]	2957
	2958	.page
	2959
	2960	bootld05: move.w #256,(a7) \| Set count for 256 words
	2961	move.l #buffer,-(a7) \| Point at buffer
	2962	bsr chksum \| Calculate checksum
	2963	addq.l #4,a7 \| Cleanup stack
	2964	cmp.w #0x1234,d0 \| Boot sector checksum ?
	2965	bne bootld06 \| Jump if not
	2966
	2967	clr.w d0 \| Set flag for OK
	2968	move.w bootdev,booted \| Save last boot device
[f40a309]	2969	bra bootld07
[4f508e6]	2970
	2971	bootld06: moveq.l #4,d0 \| "not valid boot sector"
	2972
[f40a309]	2973	bootld07: tst.l (a7)+
[4f508e6]	2974	movem.l (a7)+,d7 \| Restore registers
[f40a309]	2975	unlk a6
[4f508e6]	2976	rts \| Return to caller
	2977
[f40a309]	2978	.page
[4f508e6]	2979
	2980	\| chksum -- caluculate checksum
	2981	\| ------ -------------------
[f40a309]	2982	chksum: link a6,#0
[4f508e6]	2983	movem.l d6-d7,-(a7) \| Preserve registers
	2984	clr.w d7 \| Clear sum
	2985	bra chksum02 \| Jump into loop
	2986
	2987	chksum01: move.l 8(a6),a0 \| Get buffer address
	2988	move.w (a0),d0 \| Get word
	2989	add.w d0,d7 \| Add to checksum in d7
	2990	addq.l #2,8(a6) \| Update buffer address
	2991
	2992	chksum02: move.w 12(a6),d0 \| Get word count
	2993	subq.w #1,12(a6) \| Decrement it
	2994	tst.w d0 \| Done ?
	2995	bne chksum01 \| Loop if not
	2996
	2997	move.w d7,d0 \| Put result in d0
[f40a309]	2998	tst.l (a7)+
[4f508e6]	2999	movem.l (a7)+,d7 \| Restore registers
[f40a309]	3000	unlk a6
[4f508e6]	3001	rts \| Return to caller
	3002
[f40a309]	3003	.page
[4f508e6]	3004
	3005	\| mult32 -- 32 bit signed multiply
	3006	\| ------ ----------------------
[f40a309]	3007	mult32: link a6,#-4
	3008	clr.w d2
	3009	tst.l 8(a6)
	3010	bge mult32a
[4f508e6]	3011
[f40a309]	3012	neg.l 8(a6)
	3013	addq.w #1,d2
[4f508e6]	3014
[f40a309]	3015	mult32a: tst.l 12(a6)
	3016	bge mult32b
[4f508e6]	3017
[f40a309]	3018	neg.l 12(a6)
	3019	addq.w #1,d2
[4f508e6]	3020
[f40a309]	3021	mult32b: move.w 10(a6),d0
	3022	mulu 14(a6),d0
	3023	move.l d0,-4(a6)
	3024	move.w 8(a6),d0
	3025	mulu 14(a6),d0
	3026	move.w 12(a6),d1
	3027	mulu 10(a6),d1
	3028	add.w d1,d0
	3029	add.w -4(a6),d0
	3030	move.w d0,-4(a6)
	3031	move.l -4(a6),d0
	3032	btst #0,d2
	3033	beq mult32c
[4f508e6]	3034
[f40a309]	3035	neg.l d0
[4f508e6]	3036
[f40a309]	3037	mult32c: unlk a6
	3038	rts
[4f508e6]	3039
	3040	.page
	3041
	3042	\| rand -- Generate a random number
	3043	\| ---- ------------------------
	3044	rand: link a6,#-4 \| Reserve stack for temps
	3045	tst.l rseed \| See if the seed is zero
	3046	bne rand01 \| Jump if not
	3047
	3048	move.l _hz_200,d0 \| Pick up the 200 Hz clock
	3049	moveq.l #16,d1 \| Shift it left
	3050	asl.l d1,d0 \| ...
	3051	or.l _hz_200,d0 \| OR in current 200 Hz clock
	3052	move.l d0,rseed \| Use that as the seed
	3053
	3054	rand01: move.l #0xBB40E62D,-(a7) \| Put PI on the stack
	3055	move.l rseed,-(a7) \| ... and rseed, too
	3056	bsr mult32 \| Multiply them
	3057	addq.l #8,a7 \| Cleanup stack
	3058	addq.l #1,d0 \| Add 1 to the result
	3059	move.l d0,rseed \| Save as new seed
[f40a309]	3060	move.l rseed,d0
[4f508e6]	3061	asr.l #8,d0 \| Make it a 24 bit number
	3062	and.l #0xFFFFFF,d0 \| ...
	3063	unlk a6 \| Release stack
	3064	rts \| Return to caller
	3065
	3066	.page
	3067
	3068	\| protobt -- Generate a prototype boot sector
	3069	\| ------- --------------------------------
[f40a309]	3070	protobt: link a6,#-6
[4f508e6]	3071	movem.l d5-d7/a5,-(a7) \| Save registers
	3072	tst.w 18(a6) \| Test execflg
	3073	bge protbt03 \| Jump if set
	3074
	3075	move.w #256,(a7) \| Count = 256 words
	3076	move.l 8(a6),-(a7) \| Address of buffer
	3077	bsr chksum \| Calculate checksum
	3078	addq.l #4,a7 \| Cleanup stack
	3079	cmp.w #0x1234,d0 \| Boot checksum ?
	3080	beq protbt01 \| Jump if so
	3081
	3082	clr.w d0 \| Not executable
[f40a309]	3083	bra protbt02
[4f508e6]	3084
	3085	protbt01: moveq.l #1,d0 \| Executable
	3086
	3087	protbt02: move.w d0,18(a6) \| Set execflg
	3088
	3089	protbt03: tst.l 12(a6) \| Serial number ?
	3090	blt protbt07 \| Jump if not to be changed
	3091
	3092	move.l 12(a6),d0 \| Get it into d0
	3093	cmp.l #0xFFFFFF,d0 \| > 0xFFFFFF
	3094	ble protbt04 \| Jump if not
	3095
	3096	bsr rand \| Generate a random number
	3097	move.l d0,12(a6) \| Save as s/n
	3098
	3099	protbt04: clr.w d7 \| Clear counter
	3100	bra protbt06 \| Enter move loop
	3101
	3102	.page
	3103
	3104	protbt05: move.l 12(a6),d0 \| Get s/n
	3105	and.l #0xFF,d0 \| Isolate low 8 bits
	3106	move.w d7,a1 \| Point to next byte
	3107	add.l 8(a6),a1 \| ...
	3108	move.b d0,8(a1) \| Write byte in buffer
	3109	move.l 12(a6),d0 \| Get s/n
	3110	asr.l #8,d0 \| Shift right 8 bits
	3111	move.l d0,12(a6) \| Save shifted value
	3112	addq.w #1,d7 \| Update counter
	3113
	3114	protbt06: cmp.w #3,d7 \| See if we're done
	3115	blt protbt05 \| Loop if not
	3116
	3117	protbt07: tst.w 16(a6) \| Diskette size ?
	3118	blt protbt10 \| Jump if not to be changed
	3119
	3120	move.w 16(a6),d6 \| Get diskette size
	3121	muls.w #19,d6 \| ... times 19 as pointer
	3122	clr.w d7 \| Clear counter
	3123	bra protbt09 \| Go move in BPB
	3124
	3125	protbt08: move.w d7,a0 \| Get counter
	3126	add.l 8(a6),a0 \| Add base of buffer
	3127	move.w d6,a1 \| Get BPB pointer
	3128	add.l #pbpbtab,a1 \| Add base of prototype BPB's
	3129	move.b (a1),11(a0) \| Copy BPB data
	3130	addq.w #1,d6 \| Update pointer
	3131	addq.w #1,d7 \| Update counter
	3132
	3133	protbt09: cmp.w #19,d7 \| Done ?
	3134	blt protbt08 \| Loop if not
	3135
[f40a309]	3136	protbt10: clr.w -6(a6)
	3137	move.l 8(a6),-4(a6)
	3138	bra protbt12
[4f508e6]	3139
	3140	.page
	3141
	3142	protbt11: move.l -4(a6),a0 \| Get buffer pointer
	3143	move.w (a0),d0 \| Get word from buffer
	3144	add.w d0,-6(a6) \| Sum for checksum
	3145	addq.l #2,-4(a6) \| Point at next word
	3146
	3147	protbt12: move.l 8(a6),d0 \| Get buffer address
	3148	add.l #0x1FE,d0 \| Plus sector length
	3149	cmp.l -4(a6),d0 \| Done ?
	3150	bhi protbt11 \| Loop if not
	3151
	3152	move.w #0x1234,d0 \| Checksum for boot sector
	3153	sub.w -6(a6),d0 \| Subtract checksum for buffer
[f40a309]	3154	move.l -4(a6),a1
[4f508e6]	3155	move.w d0,(a1) \| Store checksum in buffer
	3156	tst.w 18(a6) \| Check execflg
	3157	bne protbt13 \| Boot sector to be executable ?
	3158
	3159	move.l -4(a6),a0 \| Mung checksum so it's not
[f40a309]	3160	addq.w #1,(a0)
[4f508e6]	3161
[f40a309]	3162	protbt13: tst.l (a7)+
[4f508e6]	3163	movem.l (a7)+,d6-d7/a5 \| Restore registers
	3164	unlk a6 \| Release stack
	3165	rts \| Return to caller
	3166
[f40a309]	3167	.endc
[4f508e6]	3168
	3169	\| criter -- Critical error handler
	3170	\| ------ ----------------------
	3171	criter: move.l critvec,-(a7) \| Put error vector on stack
	3172	moveq.l #-1,d0 \| Set default error return
	3173	rts \| "Return" to handler
	3174
	3175	.page
	3176
[f40a309]	3177	.ifne BUCHLA
[4f508e6]	3178
	3179	\| api_int -- Analog processor interrupt handler
	3180	\| ------- ----------------------------------
	3181	api_int: movem.l d0-d1/a0-a1,-(a7) \| Save registers
	3182	clr.l d0 \| Read input port
	3183	move.b ANALOG,d0 \| ... into d0[7..0]
	3184	move.b d0,api_inp \| ... and api_inp
	3185	btst #7,d0 \| Check for signal number flag
	3186	bne api_s0a \| Jump if signal number read
	3187
	3188	lea api_tv,a0 \| Get api_tv base in a0
	3189	clr.w d1 \| Get api_sv in d1
	3190	move.b api_sv,d1 \| ...
	3191	cmpi.b #6,d1 \| Check range
	3192	bgt api_sve \| Jump if out of range
	3193
	3194	lsl.w #2,d1 \| Develop jump address
	3195	move.l 0(a0,d1.W),a1 \| ... from api_tv in a1
	3196	jmp (a1) \| Jump to state handler
	3197
	3198	api_s0: btst #7,d0 \| Check for signal number flag
	3199	beq api_ret \| Jump if not signal number
	3200
	3201	api_s0a: clr.b api_val \| Clear value byte
	3202	andi.b #0x7F,d0 \| Mask off signal number flag
	3203	cmpi.b #82,d0 \| See if it's in range
	3204	bgt api_err \| Jump if out of range (GT 82)
	3205
	3206	move.b d0,api_sig \| Store signal number
	3207	beq api_pub \| Jump if it was "all off"
	3208
	3209	lea api_tab,a0 \| Get sv table base
	3210	move.b 0(a0,d0.W),api_sv \| Set sv for next time
	3211
	3212	api_ret: movem.l (a7)+,d0-d1/a0-a1 \| Restore registers
	3213	rte \| Return to interrupted code
	3214
	3215	api_err: move.b d0,api_bug \| Catch the bug
	3216	clr.b api_sv \| Force state zero
	3217	bra api_ret \| Go back to interrupted code
	3218
	3219	api_sve: move.b d1,api_svb \| Catch the bug
	3220	clr.b api_sv \| Force state zero
	3221	bra api_ret \| Go back to interrupted code
	3222
	3223	.page
	3224	api_s1: btst #0,d0 \| See if it takes a value
	3225	beq api_s1a \| Jump if not
	3226
	3227	move.b #2,api_sv \| Set sv for state 2
	3228	bra api_ret \| Go return from interrupt
	3229
	3230	api_s1a: clr.b api_val \| Clear value byte
	3231	bra api_pub \| Go output to fifo
	3232
	3233	api_s2: ori.b #0x80,d0 \| Set status = 1
	3234	move.b d0,api_val \| Set value byte
	3235	bra api_pub \| Go output to fifo
	3236
	3237	api_s3: ror.b #1,d0 \| Set status in value byte
	3238	andi.b #0x80,d0 \| ...
	3239	move.b d0,api_val \| ...
	3240	move.b #4,api_sv \| Set sv for state 4
	3241	bra api_ret \| Go return from interrupt
	3242
	3243	api_s4: or.b d0,api_val \| Set value byte
	3244	bra api_pub \| Go output to fifo
	3245
	3246	api_s5: ror.b #1,d0 \| Set status in value byte
	3247	andi.b #0x80,d0 \| ...
	3248
	3249	api_s6: move.b d0,api_val \| Set value byte
	3250
	3251	api_pub: movea.l api_fi,a0 \| Get fifo input pointer in a0
	3252	move.w api_sig,(a0)+ \| Store new input
	3253	cmpa.l #api_fe,a0 \| Wrap around ?
	3254	blt api_pb1 \| Jump if not
	3255
	3256	movea.l #api_fum,a0 \| Wrap input pointer to start
	3257
	3258	api_pb1: move.l a0,api_fi \| Update input pointer
	3259	cmpa.l api_fo,a0 \| Buffer full ?
	3260	bne api_pb3 \| Jump if not
	3261
	3262	movea.l api_fo,a1 \| Get fifo output pointer in a1
	3263	adda.l #2,a1 \| Increment it
	3264	cmpa.l #api_fe,a1 \| Wrap around ?
	3265	blt api_pb2 \| Jump if not
	3266
	3267	movea.l #api_fum,a1 \| Wrap output pointer to start
	3268
	3269	api_pb2: move.l a1,api_fo \| Set new output pointer
	3270
	3271	api_pb3: clr.b api_sv \| Set state to 0
	3272	bra api_ret \| Return from interrupt
	3273
	3274	.page
	3275
	3276	\| api_get -- Get analog input
	3277	\| ------- ----------------
	3278	api_get: move.w sr,-(a7) \| Save status register
	3279	ori.w #IPL3,sr \| Disable ANALOG I/O interrupts
	3280	movea.l api_fo,a0 \| Get fifo output pointer
	3281	cmpa.l api_fi,a0 \| See if fifo is empty
	3282	bne api_g1 \| Jump if not
	3283
	3284	moveq.l #-1,d0 \| Set empty-fifo value
	3285	move.w (a7)+,sr \| Restore interrupt mask
	3286	rts \| Return to caller
	3287
	3288	api_g1: clr.l d0 \| Get fifo value
	3289	move.w (a0)+,d0 \| ...
	3290	cmpa.l #api_fe,a0 \| See if pointer wrapped
	3291	blt api_g2 \| Jump if not
	3292
	3293	movea.l #api_fum,a0 \| Wrap the pointer around
	3294
	3295	api_g2: move.l a0,api_fo \| Update pointer
	3296	move.w (a7)+,sr \| Restore interrupt mask
	3297	rts \| Return to caller
	3298
	3299	\| api_zap -- clear analog I/O FIFO
	3300	\| ------- ---------------------
	3301	api_zap: move.w sr,-(a7) \| Save status register
	3302	ori.w #IPL3,sr \| Disable ANALOG I/O interrupts
	3303	move.l #api_fum,api_fi \| Clear analog processor fifo
	3304	move.l #api_fum,api_fo \| ...
	3305	move.w (a7)+,sr \| Restore interrupt mask
[f40a309]	3306	rts
[4f508e6]	3307
[f40a309]	3308	.endc
[4f508e6]	3309
	3310	.page
	3311	\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|
	3312	\| \|
	3313	\| Constant definitions \|
	3314	\| -------------------- \|
	3315	\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|
	3316
[f40a309]	3317	.even
[4f508e6]	3318
[f40a309]	3319	.ifne BUCHLA
[4f508e6]	3320
	3321	\| Buchla 700 tables:
	3322
	3323	\| t13tab -- Trap-13 pointer table -- Primary BIOS functions
	3324	\| ------ -----------------------------------------------
	3325	t13tab: dc.w 12 \| Number of Trap-13 routines
	3326
	3327	dc.l nullrts \| 0 - (getmpb)
	3328	dc.l bconstat \| 1 - bconstat
	3329	dc.l bconin \| 2 - bconin
	3330	dc.l bconout \| 3 - bconout
	3331	dc.l rwabs \| 4 - rwabs
	3332	dc.l setexec \| 5 - setexec
	3333	dc.l nullrts \| 6 - (tickcal)
	3334	dc.l getbpb \| 7 - getbpb
	3335	dc.l bcostat \| 8 - bcostat
	3336	dc.l mediach \| 9 - mediach
	3337	dc.l drvmap \| 10 - drvmap
	3338	dc.l nullrts \| 11 - (shift)
	3339
	3340	.page
	3341
	3342	\| t14tab -- Trap-14 pointer table -- Extended BIOS functions (Buchla 700 only)
	3343	\| ------ ------------------------------------------------------------------
	3344	t14tab: dc.w 10 \| Number of trap14 routines
	3345
	3346	dc.l piorec \| 0 - Get iorec address
	3347	dc.l setport \| 1 - Set ACIA parameters
	3348	dc.l floprd \| 2 - Read floppy
	3349	dc.l flopwr \| 3 - Write floppy
	3350	dc.l flopfmt \| 4 - Format floppy
	3351	dc.l flopver \| 5 - Verify floppy
	3352	dc.l protobt \| 6 - Create prototype boot sec.
	3353	dc.l rand \| 7 - Generate random number
	3354	dc.l api_get \| 8 - Get analog input
	3355	dc.l api_zap \| 9 - Clear analog FIFO
	3356
[f40a309]	3357	.endc
[4f508e6]	3358
[f40a309]	3359	.even
[4f508e6]	3360
[f40a309]	3361	.ifeq BUCHLA
[4f508e6]	3362
	3363	\| NASA 3D Helmet tables:
	3364
	3365	\| t13tab -- Trap-13 pointer table -- Primary BIOS functions
	3366	\| ------ -----------------------------------------------
	3367	t13tab: dc.w 12 \| Number of Trap-13 routines
	3368
	3369	dc.l nullrts \| 0 - (getmpb)
	3370	dc.l bconstat \| 1 - bconstat
	3371	dc.l bconin \| 2 - bconin
	3372	dc.l bconout \| 3 - bconout
	3373	dc.l nullrts \| 4 - (rwabs)
	3374	dc.l setexec \| 5 - setexec
	3375	dc.l nullrts \| 6 - (tickcal)
	3376	dc.l nullrts \| 7 - (getbpb)
	3377	dc.l bcostat \| 8 - bcostat
	3378	dc.l nullrts \| 9 - (mediach)
	3379	dc.l nullrts \| 10 - (drvmap)
	3380	dc.l nullrts \| 11 - (shift)
	3381
	3382	.page
	3383
	3384	\| t14tab -- Trap-14 pointer table -- Extended BIOS functions (Buchla 700 only)
	3385	\| ------ ------------------------------------------------------------------
	3386	t14tab: dc.w 10 \| Number of trap14 routines
	3387
	3388	dc.l piorec \| 0 - Get iorec address
	3389	dc.l setport \| 1 - Set ACIA parameters
	3390	dc.l nullrts \| 2 - (Read floppy)
	3391	dc.l nullrts \| 3 - (Write floppy)
	3392	dc.l nullrts \| 4 - (Format floppy)
	3393	dc.l nullrts \| 5 - (Verify floppy)
	3394	dc.l nullrts \| 6 - (Create prototype boot sec.)
	3395	dc.l nullrts \| 7 - (Generate random number)
	3396	dc.l nullrts \| 8 - (Get analog input)
	3397	dc.l nullrts \| 9 - (Clear analog FIFO)
	3398
[f40a309]	3399	.endc
[4f508e6]	3400
	3401	.page
	3402
	3403	\| cdt01 -- Character device dispatch table #1 -- input status
	3404	\| ----- --------------------------------------------------
	3405	cdt01: dc.l sr1ist \| 0 - PRT -- Printer
	3406	dc.l sr2ist \| 1 - AUX -- Serial-2
	3407	dc.l sr2ist \| 2 - CON -- Console
	3408
[f40a309]	3409	.ifne BUCHLA
[4f508e6]	3410
	3411	dc.l mc1ist \| 3 - MC1 -- MIDI-1
	3412	dc.l mc2ist \| 4 - MC2 -- MIDI-2
	3413
[f40a309]	3414	.endc
[4f508e6]	3415
	3416	\| cdt02 -- Character device dispatch table #2 -- input
	3417	\| ----- -------------------------------------------
	3418	cdt02: dc.l sr1inp \| 0 - PRT -- Printer
	3419	dc.l sr2inp \| 1 - AUX -- Serial-2
	3420	dc.l sr2inp \| 2 - CON -- Console
	3421
[f40a309]	3422	.ifne BUCHLA
[4f508e6]	3423
	3424	dc.l mc1inp \| 3 - MC1 -- MIDI-1
	3425	dc.l mc2inp \| 4 - MC2 -- MIDI-2
	3426
[f40a309]	3427	.endc
[4f508e6]	3428
	3429	\| cdt03 -- Character device dispatch table #3 -- output
	3430	\| ----- --------------------------------------------
	3431	cdt03: dc.l sr1out \| 0 - PRT -- Printer
	3432	dc.l sr2out \| 1 - AUX -- Serial-2
	3433	dc.l sr2out \| 2 - CON -- Console
[f40a309]	3434	.ifne BUCHLA
[4f508e6]	3435
	3436	dc.l mc1out \| 3 - MC1 -- MIDI-1
	3437	dc.l mc2out \| 4 - MC2 -- MIDI-2
	3438
[f40a309]	3439	.endc
[4f508e6]	3440
	3441	\| cdt04 -- Character device dispatch table #4 -- output status
	3442	\| ----- ---------------------------------------------------
	3443	cdt04: dc.l sr1ost \| 0 - PRT -- Printer
	3444	dc.l sr2ost \| 1 - AUX -- Serial-2
	3445	dc.l sr2ost \| 2 - CON -- Console
[f40a309]	3446	.ifne BUCHLA
[4f508e6]	3447
	3448	dc.l mc1ost \| 3 - MC1 -- MIDI-1
	3449	dc.l mc2ost \| 4 - MC2 -- MIDI-2
	3450
[f40a309]	3451	.endc
[4f508e6]	3452
[f40a309]	3453	.page
[4f508e6]	3454
	3455	\| iorec defaults:
	3456	\| ---------------
	3457	\| Serial-1:
	3458	\| ---------
[f40a309]	3459	sr1dflt: dc.l sr1ibuf
	3460	dc.w SR1IBS
	3461	dc.w 0,0
	3462	dc.w SR1IBS/4
	3463	dc.w SR1IBS-(SR1IBS/4)
	3464	dc.l sr1obuf
	3465	dc.w SR1OBS
	3466	dc.w 0,0
	3467	dc.w SR1OBS/4
	3468	dc.w SR1OBS-(SR1OBS/4)
	3469	dc.b SR1CFR0,SR1CFR1
	3470	dc.b 0,0
	3471	dc.b SR1DISC,0
	3472	dc.b 0,0
	3473	dc.w 0,0
[4f508e6]	3474
	3475	\| Serial-2:
	3476	\| ---------
[f40a309]	3477	sr2dflt: dc.l sr2ibuf
	3478	dc.w SR2IBS
	3479	dc.w 0,0
	3480	dc.w SR2IBS/4
	3481	dc.w SR2IBS-(SR2IBS/4)
	3482	dc.l sr2obuf
	3483	dc.w SR2OBS
	3484	dc.w 0,0
	3485	dc.w SR2OBS/4
	3486	dc.w SR2OBS-(SR2OBS/4)
	3487	dc.b SR2CFR0,SR2CFR1
	3488	dc.b 0,0
	3489	dc.b SR2DISC,0
	3490	dc.b 0,0
	3491	dc.w 0,0
[4f508e6]	3492
[f40a309]	3493	.page
[4f508e6]	3494
[f40a309]	3495	.ifne BUCHLA
[4f508e6]	3496
	3497	\| MIDI-1:
	3498	\| -------
[f40a309]	3499	mc1dflt: dc.l mc1ibuf
	3500	dc.w MC1IBS
	3501	dc.w 0,0
	3502	dc.w MC1IBS/4
	3503	dc.w MC1IBS-(MC1IBS/4)
	3504	dc.l mc1obuf
	3505	dc.w MC1OBS
	3506	dc.w 0,0
	3507	dc.w MC1OBS/4
	3508	dc.w MC1OBS-(MC1OBS/4)
	3509	dc.b MC1CFR0,MC1CFR1
	3510	dc.b 0,0
	3511	dc.b MC1DISC,0
	3512	dc.b 0,0
	3513	dc.w 0,0
[4f508e6]	3514
	3515	\| MIDI-2:
	3516	\| -------
[f40a309]	3517	mc2dflt: dc.l mc2ibuf
	3518	dc.w MC2IBS
	3519	dc.w 0,0
	3520	dc.w MC2IBS/4
	3521	dc.w MC2IBS-(MC2IBS/4)
	3522	dc.l mc2obuf
	3523	dc.w MC2OBS
	3524	dc.w 0,0
	3525	dc.w MC2OBS/4
	3526	dc.w MC2OBS-(MC2OBS/4)
	3527	dc.b MC2CFR0,MC2CFR1
	3528	dc.b 0,0
	3529	dc.b MC2DISC,0
	3530	dc.b 0,0
	3531	dc.w 0,0
[4f508e6]	3532
[f40a309]	3533	.endc
[4f508e6]	3534
	3535	.page
	3536
	3537	\| brtable -- Baud rate setup table
	3538	\| ------- ---------------------
	3539	brtable: dc.b BR_19K2 \| 0 - 19200 baud
	3540	dc.b BR_9600 \| 1 - 9600 baud
	3541	dc.b BR_4800 \| 2 - 4800 baud
	3542	dc.b BR_3600 \| 3 - 3600 baud
	3543	dc.b BR_2400 \| 4 - 2400 baud
	3544	dc.b BR_7200 \| 5 - 7200 baud (2000 on Atari)
	3545	dc.b BR_1800 \| 6 - 1800 baud
	3546	dc.b BR_1200 \| 7 - 1200 baud
	3547	dc.b BR_600 \| 8 - 600 baud
	3548	dc.b BR_300 \| 9 - 300 baud
	3549
	3550	\| iortab -- iorec pointer table
	3551	\| ------ -------------------
	3552	iortab: dc.l sr1iorec \| 0 - PRT Serial-1 Printer
	3553	dc.l sr2iorec \| 1 - AUX Serial-2 Host
	3554	dc.l sr2iorec \| 2 - CON Serial-2 Console
	3555
[f40a309]	3556	.ifne BUCHLA
[4f508e6]	3557
	3558	dc.l mc1iorec \| 3 - MC1 MIDI-1 MIDI port #1
	3559	dc.l mc2iorec \| 4 - MC2 MIDI-2 MIDI port #2
	3560
[f40a309]	3561	.endc
[4f508e6]	3562
	3563	\| aciatab -- iorec and ACIA pointer table
	3564	\| ------- ----------------------------
	3565	aciatab: dc.l sr1iorec,SR1ACIA \| 0 - PRT Serial-1
	3566	dc.l sr2iorec,SR2ACIA \| 1 - AUX Serial-2
	3567	dc.l sr2iorec,SR2ACIA \| 2 - CON Serial-2
	3568
[f40a309]	3569	.ifne BUCHLA
[4f508e6]	3570
	3571	dc.l mc1iorec,MC1ACIA \| 3 - MC1 MIDI-1
	3572	dc.l mc2iorec,MC2ACIA \| 4 - MC2 MIDI-2
	3573
[f40a309]	3574	.endc
[4f508e6]	3575
[f40a309]	3576	.page
[4f508e6]	3577
[f40a309]	3578	.ifne BUCHLA
[4f508e6]	3579
	3580	\| pbpbtab -- Prototype BPB data table (BPS..NHID) 19 bytes per entry
	3581	\| ------- ---------------------------------------------------------
	3582
	3583	\| 0 -- 40 tracks, single sided (180K)
	3584
	3585	pbpbtab: dc.b 0x00,0x02,0x01,0x01,0x00,0x02,0x40,0x00
	3586	dc.b 0x68,0x01,0xFC,0x02,0x00,0x09,0x00,0x01
	3587	dc.b 0x00,0x00,0x00
	3588
	3589	\| 1 -- 40 tracks, double sided (360K)
	3590
	3591	dc.b 0x00,0x02,0x02,0x01,0x00,0x02,0x70,0x00
	3592	dc.b 0xD0,0x02,0xFD,0x02,0x00,0x09,0x00,0x02
	3593	dc.b 0x00,0x00,0x00
	3594
	3595	\| 2 -- 80 tracks, single sided (360K)
	3596
	3597	dc.b 0x00,0x02,0x02,0x01,0x00,0x02,0x70,0x00
	3598	dc.b 0xD0,0x02,0xF8,0x05,0x00,0x09,0x00,0x01
	3599	dc.b 0x00,0x00,0x00
	3600
	3601	\| 3 -- 80 tracks, double sided (720K)
	3602
	3603	dc.b 0x00,0x02,0x02,0x01,0x00,0x02,0x70,0x00
	3604	dc.b 0xA0,0x05,0xF9,0x05,0x00,0x09,0x00,0x02
	3605	dc.b 0x00,0x00,0x00
	3606
	3607	\| VSDD initialization table
	3608
[f40a309]	3609	.even
[4f508e6]	3610
	3611	vsddtab: dc.w 0x8252 \| R0 Mode word 0
	3612	dc.w 0xE474 \| R1 Mode word 1
	3613	dc.w 0x0006 \| R2 Register window base
	3614	dc.w 0x0100 \| R3 Data window base
	3615	dc.w 0x0000 \| R4 Data length mask
	3616	dc.w 0x0000 \| R5 Data segment base
	3617	dc.w 0x0001 \| R6 Priority access count
	3618	dc.w 0x0040 \| R7 ODT base
	3619	dc.w 0x0080 \| R8 AT base
	3620	dc.w 0x0010 \| R9 CLT base
	3621	dc.w 0x0011 \| R10 CG bases
	3622	dc.w 0x0000 \| R11 AT counter (R/O)
	3623
	3624	dc.w 0x0C08 \| R12 HC0 = 3, VC0 = 8
	3625	dc.w 0x140A \| R13 HC1 = 5, VC1 = 10
	3626	dc.w 0x9568 \| R14 HC2 = 37, VC2 = 360
	3627	dc.w 0xA16A \| R15 HC3 = 40, VC3 = 362
	3628
	3629	vsddit01: dc.w 0x8253 \| R0 with UCF = 1, DEN = 0
	3630	vsddit02: dc.w 0x825B \| R0 with UCF = 1, DEN = 1
	3631
	3632	.page
	3633
	3634	\| analog processor input state table
	3635
	3636	api_tab: dc.b 0,1,1,1,1,1,1,1,1,1 \| 0..9
	3637	dc.b 1,1,1,1,1,1,1,1,1,1 \| 10..19
	3638	dc.b 1,1,1,1,1 \| 20..24
	3639	dc.b 3,3,3,3,3 \| 25..29
	3640	dc.b 3,3,3,3,3,3,3,3,3 \| 30..38
	3641	dc.b 5 \| 39
	3642	dc.b 5,5,5,5,5,5,5,5,5,5 \| 40..49
	3643	dc.b 5,5,5 \| 50..52
	3644	dc.b 3,3,3,3,3,3,3 \| 53..59
	3645	dc.b 5,5,5,5,5,5,5,5,5,5 \| 60..69
	3646	dc.b 5,5,5 \| 70..72
	3647	dc.b 6,6,6,6,6,6,6 \| 73..79
	3648	dc.b 6,6,6 \| 80..82
	3649
[f40a309]	3650	.even
[4f508e6]	3651
	3652	\| analog processor state transfer vector
	3653
[f40a309]	3654	api_tv: dc.l api_s0,api_s1,api_s2,api_s3
	3655	dc.l api_s4,api_s5,api_s6
[4f508e6]	3656
[f40a309]	3657	.endc
[4f508e6]	3658
	3659	.page
	3660	\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|
	3661	\| \|
	3662	\| RAM storage definitions \|
	3663	\| ----------------------- \|
	3664	\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|
	3665
[f40a309]	3666	.bss
	3667	.even
[4f508e6]	3668
	3669	\| RAM data area
	3670	\| -------------
	3671	\| WARNING:
	3672	\| --------
	3673	\| The variables from timevec through rsarea are permanently assigned so
	3674	\| that we can link to certain bios variables without having to link to the
	3675	\| bios object file itself. Some of these get defined in hwdefs.s and in
	3676	\| hwdefs.s so beware of changing them.
	3677
	3678	timevec: ds.l 1 \| System timer trap vector
	3679	critvec: ds.l 1 \| Critical error handler vector
	3680	termvec: ds.l 1 \| Process terminate hook vector
	3681	resvec3: ds.l 1 \| Reserved vector 3
	3682	resvec4: ds.l 1 \| Reserved vector 4
	3683	resvec5: ds.l 1 \| Reserved vector 5
	3684	resvec6: ds.l 1 \| Reserved vector 6
	3685	resvec7: ds.l 1 \| Reserved vector 7
	3686
	3687	fc_sw: ds.w 1 \| Frame clock switch (<0=dn, 0=off, >0=up)
	3688	fc_val: ds.l 1 \| Frame clock value (0..FCMAX)
	3689
	3690	_wzcrsh: ds.w 1 \| Crash area: flag for ROMP
	3691	_crshsr: ds.w 1 \| Crash area: SR
	3692	_crshpc: ds.l 1 \| Crash area: PC
	3693	_crshsp: ds.l 1 \| Crash area: SP
	3694	_crshus: ds.l 1 \| Crash area: USP
	3695	_crshvc: ds.l 1 \| Crash area: vector # in MS byte
	3696	_crshrg: ds.l 16 \| Crash area: registers
	3697	_crshst: ds.w 16 \| Crash area: top 16 words of stack
	3698
	3699	\| The area from biosram to SSTACK-1 is cleared on reset.
	3700	\| ------------------------------------------------------
	3701	biosram: \| Start of BIOS RAM variables
	3702
[f40a309]	3703	.ifne BUCHLA
[4f508e6]	3704
	3705	_hz_1k: ds.l 1 \| 1000 Hz clock
	3706	_hz_200: ds.l 1 \| 200 Hz clock
	3707	frclock: ds.l 1 \| 50 Hz clock
	3708	t1count: ds.w 1 \| Timer 1 count
	3709	t2count: ds.w 1 \| Timer 2 count
	3710	t3count: ds.w 1 \| Timer 3 count
	3711
	3712	seekrate: ds.w 1 \| Seek rate
	3713	cdev: ds.w 1 \| Current drive
	3714	ctrack: ds.w 1 \| Current track
	3715	csect: ds.w 1 \| Current sector
	3716	cside: ds.w 1 \| Current side
	3717	ccount: ds.w 1 \| Current sector count
	3718	spt: ds.w 1 \| Sectors per track
	3719	interlv: ds.w 1 \| Sector interleave count
	3720	virgin: ds.w 1 \| Initial formatting data
	3721	deferr: ds.w 1 \| Default error number
	3722	curerr: ds.w 1 \| Current error number
	3723
	3724	cdma: ds.l 1 \| Current DMA address
	3725	edma: ds.l 1 \| Ending DMA address
	3726	tmpdma: ds.l 1 \| Temporary DMA address
	3727
[f40a309]	3728	.endc
[4f508e6]	3729
	3730	rseed: ds.l 1 \| Random number seed
	3731
	3732	savptr: ds.l 1 \| Pointer to register save area
	3733
	3734	_rsflag: ds.l 1 \| Register save area overflow flag
	3735	ds.l 18\|32 \| Register save area (32 levels)
	3736	rsarea: ds.l 1 \| Dummy long word at top of save area
	3737
	3738	\| \|\|\|\|\| end of the permanently assigned bios variables \|\|\|\|\|
	3739
	3740	.page
	3741
[f40a309]	3742	.ifne BUCHLA
[4f508e6]	3743
	3744	acctim: ds.l 2 \| Accumulated disk time table
	3745	maxactim: ds.l 1 \| Maximum acctim value
	3746	hdv_init: ds.l 1 \| Disk init vector
	3747	hdv_bpb: ds.l 1 \| Disk get bpb vector
	3748	hdv_rw: ds.l 1 \| Disk r/w vector
	3749	hdv_boot: ds.l 1 \| Disk boot vector
	3750	hdv_mchg: ds.l 1 \| Disk media change vector
	3751	drvbits: ds.l 1 \| Drive map bits
	3752	dskbufp: ds.l 1 \| Disk buffer pointer
	3753	.page
	3754	nflops: ds.w 1 \| Number of drives
	3755	disknum: ds.w 1 \| Current disk number
	3756	booted: ds.w 1 \| Most recent boot device or -1
	3757	flock: ds.w 1 \| Floppy semaphore
	3758	fverify: ds.w 1 \| Floppy verify flag
	3759
	3760	tdiv1: ds.w 1 \| Timer divider 1 (divides _hz_1k)
	3761	tdiv2: ds.w 1 \| Timer divider 2 (divides _hz_200)
	3762
	3763	retrycnt: ds.w 1 \| Re-try count
	3764	wpstatus: ds.w 1 \| Write protect status table
	3765	wplatch: ds.w 1 \| Write protect latch table
	3766	bootdev: ds.w 1 \| Boot device number
	3767
	3768	motoron: ds.w 1 \| Motor-on flag
	3769	deslflag: ds.w 1 \| Drive deselect flag
	3770
[f40a309]	3771	.endc
[4f508e6]	3772
	3773	flpsrsv: ds.w 1 \| Status register save area
	3774	flpregs: ds.l 16 \| Register save area
	3775
[f40a309]	3776	.ifne BUCHLA
[4f508e6]	3777
	3778	dsb0: ds.l 1 \| Drive A DSB
	3779	dsb1: ds.l 1 \| Drive B DSB
	3780
	3781	dskmode: ds.b 2 \| Disk change mode table
	3782	dskerrs: ds.w 2 \| Disk error code table
	3783	drvbpbs: ds.w 16\|2 \| Disk BPB save area
	3784
[f40a309]	3785	.endc
[4f508e6]	3786
[f40a309]	3787	.page
[4f508e6]	3788
	3789	sr1iorec: ds.b IORECLN \| Serial-1 iorec structure
	3790	sr2iorec: ds.b IORECLN \| Serial-2 iorec structure
	3791
[f40a309]	3792	.ifne BUCHLA
[4f508e6]	3793
	3794	mc1iorec: ds.b IORECLN \| MIDI-1 iorec structure
	3795	mc2iorec: ds.b IORECLN \| MIDI-2 iorec structure
	3796
[f40a309]	3797	.endc
[4f508e6]	3798
	3799	sr1ibuf: ds.b SR1IBS \| Serial-1 input buffer
	3800	sr1obuf: ds.b SR1OBS \| Serial-1 output buffer
	3801	sr2ibuf: ds.b SR2IBS \| Serial-2 input buffer
	3802	sr2obuf: ds.b SR2OBS \| Serial-2 output buffer
	3803
[f40a309]	3804	.ifne BUCHLA
[4f508e6]	3805
	3806	mc1ibuf: ds.b MC1IBS \| MIDI-1 input buffer
	3807	mc1obuf: ds.b MC1OBS \| MIDI-1 output buffer
	3808	mc2ibuf: ds.b MC2IBS \| MIDI-2 input buffer
	3809	mc2obuf: ds.b MC2OBS \| MIDI-2 output buffer
	3810
	3811	api_inp: ds.b 1 \| Analog processor input byte
	3812	api_bug: ds.b 1 \| Analog processor signal # "bug trap"
	3813	api_sv: ds.b 1 \| Analog processor state
	3814	api_svb: ds.b 1 \| Analog processor state "bug trap"
	3815
[f40a309]	3816	.even
[4f508e6]	3817
	3818	api_sig: ds.b 1 \| Analog signal number
	3819	api_val: ds.b 1 \| Analog value
	3820
	3821	api_fi: ds.l 1 \| Analog processor FIFO input pointer
	3822	api_fo: ds.l 1 \| Analog processor FIFO output pointer
	3823	api_fum: ds.w APISIZE \| Analog processor FIFO
	3824	api_fe: \| End of analog processor FIFO
	3825
[f40a309]	3826	.endc
[4f508e6]	3827
[f40a309]	3828	.even
[4f508e6]	3829
	3830	basepage: ds.l 64 \| Pseudo base page
	3831
	3832	buffer: ds.b 1024 \| Default disk buffer
	3833
	3834	biostop: \| End of BIOS RAM
	3835
[f40a309]	3836	.end

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