Say ABCD.
[fpgaboy.git] / diag.asm
index 77c5202..e7bb0d4 100644 (file)
--- a/diag.asm
+++ b/diag.asm
@@ -51,22 +51,40 @@ 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 %01111100
+       db %11000110
+       db %11000110
+       db %11111110
+       db %11000110
+       db %11000110
+       db %11000110
        db %00000000
+       
+       db %11111100
+       db %11000110
+       db %11000110
+       db %11111100
+       db %11000110
+       db %11000110
+       db %11111100
        db %00000000
+
+       db %01111100
+       db %11000110
+       db %11000010
+       db %11000000
+       db %11000010
+       db %11000110
+       db %01111100
        db %00000000
+
+       db %11111100
+       db %11000110
+       db %11000110
+       db %11000110
+       db %11000110
+       db %11000110
+       db %11111100
        db %00000000
 
 putscreen:
@@ -75,7 +93,7 @@ putscreen:
 
        ld hl, $8000    ; Copy two tiles.
        ld de, tiles
-       ld c, $10
+       ld c, $20
 .cloop:        push hl
        ld h, d
        ld l, e
@@ -93,9 +111,9 @@ putscreen:
 .vloop:        call .vblwait
        ld c, $40
        ld b, 0
-.loop: inc b
-       ld a, b
-       and $01
+.loop: ld a, b
+       inc b
+       and $03
        ld [hli], a
        ld a, h
        cp $9C
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