X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/97d31911d562d3bbb07f44e027aa1886ac914a99..537e1f833b8eba858c06053ea6006ea608b9a5cc:/rom.asm

diff --git a/rom.asm b/rom.asm
index 640c2b0..1a2221f 100644
--- a/rom.asm
+++ b/rom.asm
@@ -1,139 +1,71 @@
 	SECTION "a",HOME
+
 main:
-	ld c, $51
+	ld c, $51	; Note that we are alive.
 	ld a, $FF
 	ld [c],a
-	ld sp,$DFFF
-
-	ld hl,text
-	call puts
 	
-	call memtest
-	call waitsw
-	jp main
-
-text:
-	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
-
-memtest:
-	ld hl,memteststr
-	call puts
+	ld sp, $DFF0
 	
-	ld hl, $C000
-.wr:
-	ld a,h
-	xor l
-	ld [hli],a
-	ld a, $DF
-	cp h
-	jp nz, .wr
+	ld hl, $DF81
 	ld a, $80
-	cp l
-	jp nz, .wr
+	ld [hl], a
 
-	ld hl, $C000
-.rd:
-	ld a,h
-	xor l
-	ld b,a
-	ld a, [hli]
-	cp b
-	jp nz, .memfail
-	
-	ld a, $DF
-	cp h
-	jp nz, .rd
-	ld a, $80
-	cp l
-	jp nz, .rd
-	
-	ld hl, testokstr
-	call puts
-	ret
-.memfail:
-	@ decrement hl the easy way
-	ld a,[hld]
-	push hl
-	ld hl, failatstr
-	call puts
-	pop hl
-	ld a, h
-	call puthex
-	ld a, l
-	call puthex
-	ld a, $0A
-	call putc
-	ld a, $0D
-	call putc
-	ret
+	ld c, $07
+	ld a, $04	;start timer, 4.096KHz
+	ld [c], a
+;diqs:	ei
+;	ld a, $80
+;	ld c, $51
+;	ld [c], a
+;	jr diqs
+	call irqhand
+	ei
+coqs: jr coqs
 
-memteststr:
-	db "Testing memory from $C000 to $DF80...",0
-testokstr:
-	db " OK!",$0D,$0A,0
-failatstr:
-	db " Test failed at $",0
-puthex:
-	push af
-	rra
-	rra
-	rra
-	rra
-	ld b,$0F
-	and b
-	ld b,$30
-	add b
-	call putc
-	pop af
-	ld b,$0F
-	and b
-	ld b,$30
-	add b
-	call putc
-	ret
+	section "Diq", HOME[$38]
+fuqed:
+	di
+	jr fuqed
 
-waitsw:
-	ld hl,waitswstr
-	call puts
+	section "fuq",HOME[$100]
+irqhand:
+	PUSH AF
+	PUSH BC
+	PUSH DE
+	PUSH HL
 	
-	ld c, $51
-	ld a, $00
-	ld [c],a
+	xor a
+	ld c, $0F	; ack the irq
+	ld [c], a
 	
+	ld a, $41	; print A
+	call putc
+	
+	ld hl, $DF81
+	inc [hl]
+	ld a, [hl]
 	ld c, $51
-	ld b, $0
-.loop1:
-	ld a,[c]
-	cp b
-	jp z,.loop1
-.loop2:
-	ld a,[c]
-	cp b
-	jp nz,.loop2
-	ret
+	ld [c], a
 
-waitswstr:
-	db "Diagnostic ROM complete; flip switches to nonzero and then to zero to reset.",$0D,$0A,0
+
+	POP HL
+	POP DE
+	POP BC
+	POP AF
+	RETI
+	db $18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE
+	db $18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE
+	db $18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE,$18,$FE
 
 putc:
-	push af
 	ld b, 0
 	ld c, $50
+	push af
 .waitport:
 	ld a,[c]
 	cp b
-	jp nz,.waitport
+	jr nz,.waitport
 	pop af
 	ld [c],a
 	ret
-
-puts:
-	ld a, [hli]
-	ld b, $00
-	cp b
-	jp z, .done
-	call putc
-	jp puts
-.done:
-	ret
-