Index: Makefile
===================================================================
--- Makefile	(revision 499da167d28b5c4a8b1ed7df56dc8a97bca0eca1)
+++ Makefile	(revision cd1d0dbda8955b8350519569393ec7fb33edad47)
@@ -25,5 +25,5 @@
 HEADERS :=		$(wildcard include/*.h)
 
-all:			bios.img midas.abs
+all:			bios.abs midas.abs
 
 PROLOG_C :=		croot.c
@@ -166,4 +166,9 @@
 build/%.o:		rom/%.s $(HEADERS) | build
 				$(CROSS_GCC) $(FLAGS_ASM) -c -o $@ $<
+
+bios.abs:		bios.elf bios.img
+				misc/mkhd.sh $(CROSS_NM) bios.elf >/tmp/bios.hdr
+				cat /tmp/bios.hdr bios.img >bios.abs
+				rm /tmp/bios.hdr
 
 bios.img:		bios.elf