X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/fe3dc8909a6c72ce4208cb5b8b64bc6b2f8cebd6..03202f62407e24bd964016dccc06de95df622e3c:/diag.asm

diff --git a/diag.asm b/diag.asm
index e3afaa4..8016400 100644
--- a/diag.asm
+++ b/diag.asm
@@ -24,7 +24,7 @@ main:
 	ld a, $04	;start timer, 4.096KHz
 	ld c, $07
 	ld [c], a
-
+	
 	ld hl, $DF81
 	xor a
 	ld [hli], a
@@ -49,6 +49,27 @@ 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
@@ -72,6 +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