X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/80ecd2fe23cfab4f410f8f760dea4b44d72a82c9..0dea04d38b6864e9734f5a0e556cc088887835bd:/diag.asm

diff --git a/diag.asm b/diag.asm
index 50cefe7..77c5202 100644
--- a/diag.asm
+++ b/diag.asm
@@ -50,59 +50,52 @@ main:
 signon:
 	db $0D,$0A,$1B,"[1mFPGABoy Diagnostic ROM",$1B,"[0m",$0D,$0A,0
 
+tiles:
+	db %11111111
+	db %11111111
+	db %11000011
+	db %11000011
+	db %11000011
+	db %11000011
+	db %11111111
+	db %11111111
+	
+	db %00000000
+	db %00000000
+	db %00000000
+	db %00000000
+	db %00000000
+	db %00000000
+	db %00000000
+	db %00000000
+
 putscreen:
 	; Wait for vblank
 	call .vblwait
 
 	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 de, tiles
+	ld c, $10
+.cloop:	push hl
+	ld h, d
+	ld l, e
+	ld a, [hl]
+	inc de
+	pop hl
 	ld [hli], a
 	ld [hli], a
+	dec c
 	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
+	cp c
+	jr nz, .cloop
 	
 	ld hl, $9800
 .vloop:	call .vblwait
 	ld c, $40
-.loop:	ld a, $01
-	ld [hli], a
-	xor a
+	ld b, 0
+.loop:	inc b
+	ld a, b
+	and $01
 	ld [hli], a
 	ld a, h
 	cp $9C