X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/5bac4cf0a60acac6826eb3215e1526d48ba8f7ac..ec7274034775dc5e053ff3c96bd141ac50b4fc81:/rom.asm?ds=sidebyside

diff --git a/rom.asm b/rom.asm
index 6989b2d..1504c71 100644
--- a/rom.asm
+++ b/rom.asm
@@ -1,25 +1,25 @@
 	SECTION "a",HOME
 
 main:
-	ld c, $51	; Note that we are alive.
-	ld a, $FF
-	ld [c],a
+	ld a, $FF	; Note that we are alive.
+	ld [$FF51],a
 	
 	ld sp, $DFF0
 	
-;	ld hl, $DF81
-;	ld a, $80
-;	ld [hl], a
+	ld hl, $DF81
+	ld a, $80
+	ld [hl], a
 
-;	ld c, $07
-;	ld a, $07	;start timer, 4.096KHz
-;	ld [c], a
+	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
 
 	section "Diq", HOME[$38]
@@ -34,33 +34,20 @@ irqhand:
 	PUSH DE
 	PUSH HL
 	
-;	ld c, $51
-;	ld a, $F0
-;	ld [c], a
-	
 	xor a
 	ld c, $0F	; ack the irq
 	ld [c], a
 	
-	;ld a, $41	; print A
-	;call putc
+	ld a, $41	; print A
+	call putc
 	
-;	ld hl, $DF81
-;	ld a, [hl]
-;	ld b, 1
-;	add b
-	ld a, $08
-	ld hl, $FF51
-;	ld c, $51
-	nop
-	nop
-	ld [hl], a
+	ld hl, $DF81
+	inc [hl]
+	ld a, [hl]
+	ld c, $51
+	ld [c], a
 
 
-;	ld c, $51
-;	ld a, $0F
-;	ld [c], a
-	
 	POP HL
 	POP DE
 	POP BC
@@ -69,3 +56,15 @@ irqhand:
 	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:
+	ld b, 0
+	ld c, $50
+	push af
+.waitport:
+	ld a,[c]
+	cp b
+	jr nz,.waitport
+	pop af
+	ld [c],a
+	ret