X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/00573fd53c3dc0b2aca146f085d30801a3aed576..03202f62407e24bd964016dccc06de95df622e3c:/diag.asm

diff --git a/diag.asm b/diag.asm
index 8d6aec8..8016400 100644
--- a/diag.asm
+++ b/diag.asm
@@ -1,3 +1,6 @@
+	section "end",HOME[1024]
+	nop
+
 	SECTION "a",HOME[$00]
 
 start: jp main
@@ -13,17 +16,15 @@ start: jp main
 
 main:
 	ld a, $FF
-	ld [$FF51],a
+	ld c, $51
+	ld [c], a
 
-;	ld a, $04
-;	ld [$FFFF], a
-	
 	ld sp, $DFF0
 	
 	ld a, $04	;start timer, 4.096KHz
 	ld c, $07
 	ld [c], a
-
+	
 	ld hl, $DF81
 	xor a
 	ld [hli], a
@@ -48,13 +49,36 @@ signon:
 	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
 
 vbl:
+	PUSH AF
+	PUSH BC
+	PUSH DE
+	PUSH HL
+	
+	xor a
+	ld c, $0F
+	ld [c], a
+	
+	ld c, $42	; SCY
+	ld a, [c]
+	inc a
+	ld [c], a
+
+	POP HL
+	POP DE
+	POP BC
+	POP AF
+
+	RETI
+
 lcdc:
 	PUSH AF
+	PUSH BC
 	
 	xor a
 	ld c, $0F
 	ld [c], a
 	
+	POP BC
 	POP AF
 	
 	reti
@@ -69,6 +93,11 @@ tmro:
 	ld c, $0F
 	ld [c], a
 	
+	ld c, $45	; LYC
+	ld a, [c]
+	inc a
+	ld [c], a
+	
 	ld hl, $DF82
 	ld a, [hld]
 	cp 0
@@ -76,10 +105,8 @@ tmro:
 	ld a, $41	; print A
 	call putc
 .noprint:
-	ld hl, $DF81
+	inc [hl]
 	ld a, [hl]
-	add 1
-	ld [hl], a
 	ld c, $51
 	ld [c], a
 
@@ -340,3 +367,4 @@ puts:
 	ret z
 	call putc
 	jr puts
+