X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/39a68cde9f2a76dabfcc9d7654f212ad1d7b356a..7d59dad969a6cd1e42958f4c805d1d373ee04713:/diag.asm

diff --git a/diag.asm b/diag.asm
index 7f06de0..2c843eb 100644
--- a/diag.asm
+++ b/diag.asm
@@ -51,16 +51,58 @@ signon:
 	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
 
 putscreen:
-	ld a, $FF		; Copy two tiles.
-	ld hl, $8000
+	; Wait for vblank
+.stat:	ld a, [$FF41]
+	ld [$FF51], a
+	and $03		; mode
+	cp $01		; VBLANK
+	jr nz, .stat
+
+	ld hl, $8000	; Copy two tiles.
+	ld a, $AA
+	ld [hli], a
+	ld [hli], a
+	ld a, $55
+	ld [hli], a
+	ld [hli], a
+	ld a, $AA
+	ld [hli], a
+	ld [hli], a
+	ld a, $55
+	ld [hli], a
+	ld [hli], a
+	ld a, $AA
+	ld [hli], a
+	ld [hli], a
+	ld a, $55
+	ld [hli], a
+	ld [hli], a
+	ld a, $AA
+	ld [hli], a
+	ld [hli], a
+	ld a, $55
 	ld [hli], a
 	ld [hli], a
 	xor a
 	ld [hli], a
 	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
 	
 	ld hl, $9800
-.loop:	ld a, $FF
+.loop:	ld a, $01
 	ld [hli], a
 	xor a
 	ld [hli], a
@@ -82,6 +124,11 @@ vbl:
 	ld a, [c]
 	inc a
 	ld [c], a
+	
+	ld c, $43	; SCX
+	ld a, [c]
+	inc a
+	ld [c], a
 
 	POP HL
 	POP DE