Index: misc/proto.c
===================================================================
--- misc/proto.c	(revision 23e159756f34f707cf8bef4107e0ce2e0783d334)
+++ misc/proto.c	(revision 8c8b4e5664e0c1a049b4575d5003752b342481d6)
@@ -3,9 +3,10 @@
 int8_t			ac_code;
 int16_t			errno;
-int16_t			timers[NTIMERS];
 int16_t			fp_resv[];
 int8_t			VerDate[];
-volatile uint16_t	vi_scrl;
-volatile uint16_t	vi_sadr;
+
+volatile	int16_t		timers[NTIMERS];
+volatile	uint16_t	vi_scrl;
+volatile	uint16_t	vi_sadr;
 
 int8_t			end;
@@ -176,5 +177,5 @@
 }
 
-void tsplot4(uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch)
+void tsplot4(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch)
 {
 }
@@ -189,13 +190,13 @@
 }
 
-void vclrav(uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len)
-{
-}
-
-void vcputs(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str)
-{
-}
-
-void vcputsv(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch)
+void vclrav(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len)
+{
+}
+
+void vcputs(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str)
+{
+}
+
+void vcputsv(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch)
 {
 }
@@ -209,13 +210,13 @@
 }
 
-void vputa(uint16_t *obase, int16_t row, int16_t col, uint16_t attr)
-{
-}
-
-void vputc(uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr)
-{
-}
-
-void vputcv(uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr, int16_t cols)
+void vputa(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t attr)
+{
+}
+
+void vputc(volatile uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr)
+{
+}
+
+void vputcv(volatile uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr, int16_t cols)
 {
 }
@@ -225,19 +226,17 @@
 }
 
-void vsetav(uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len)
-{
-}
-
-void vsetcv(uint16_t *obase, int16_t row, int16_t col, uint16_t fgbg, int16_t len)
-{
-}
-
-void vsplot4(uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str,
-	     int16_t pitch, int16_t ht, int16_t cgtab[][256])
-{
-}
-
-void vvputsv(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col,
-	     int8_t *str, int16_t pitch, int16_t ht, int16_t cgtab[][256])
+void vsetav(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len)
+{
+}
+
+void vsetcv(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t fgbg, int16_t len)
+{
+}
+
+void vsplot4(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch, int16_t ht, int16_t cgtab[][256])
+{
+}
+
+void vvputsv(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch, int16_t ht, int16_t cgtab[][256])
 {
 }
@@ -247,5 +246,5 @@
 }
 
-void vwputs(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str)
+void vwputs(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str)
 {
 }
Index: misc/proto.x
===================================================================
--- misc/proto.x	(revision 23e159756f34f707cf8bef4107e0ce2e0783d334)
+++ misc/proto.x	(revision 8c8b4e5664e0c1a049b4575d5003752b342481d6)
@@ -89,20 +89,20 @@
 extern	void		trap15(void);
 extern	void		tsetup(void);
-extern	void		tsplot4(uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch);
+extern	void		tsplot4(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch);
 extern	int32_t		uldiv(int32_t divid, int32_t divis);
 extern	void		vbank(int16_t b);
-extern	void		vclrav(uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len);
-extern	void		vcputs(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str);
-extern	void		vcputsv(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch);
+extern	void		vclrav(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len);
+extern	void		vcputs(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str);
+extern	void		vcputsv(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch);
 extern	void		vfwait(void);
-extern	void		vputa(uint16_t *obase, int16_t row, int16_t col, uint16_t attr);
-extern	void		vputc(uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr);
-extern	void		vputcv(uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr, int16_t cols);
+extern	void		vputa(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t attr);
+extern	void		vputc(volatile uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr);
+extern	void		vputcv(volatile uint16_t *obase, int16_t row, int16_t col, int16_t c, uint16_t attr, int16_t cols);
 extern	void		vputp(struct octent *octad, int16_t xloc, int16_t yloc, int16_t val);
-extern	void		vsetav(uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len);
-extern	void		vsetcv(uint16_t *obase, int16_t row, int16_t col, uint16_t fgbg, int16_t len);
-extern	void		vsplot4(uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch, int16_t ht, int16_t cgtab[][256]);
-extern	void		vvputsv(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch, int16_t ht, int16_t cgtab[][256]);
+extern	void		vsetav(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t attr, int16_t len);
+extern	void		vsetcv(volatile uint16_t *obase, int16_t row, int16_t col, uint16_t fgbg, int16_t len);
+extern	void		vsplot4(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t row, int16_t col, int8_t *str, int16_t pitch, int16_t ht, int16_t cgtab[][256]);
+extern	void		vvputsv(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str, int16_t pitch, int16_t ht, int16_t cgtab[][256]);
 extern	void		vwputp(struct octent *octad, int16_t xloc, int16_t yloc, int16_t val);
-extern	void		vwputs(uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str);
+extern	void		vwputs(volatile uint16_t *obase, int16_t nw, int16_t fg, int16_t bg, int16_t row, int16_t col, int8_t *str);
 extern	void		xtrap15(void);