Add bit instruction

[fpgaboy.git] / diag.asm

diff --git a/diag.asm b/diag.asm
index c832ff2c6c6ba69de8fb24e2a3a8054a06a587b3..e9a9f19a602d70f15445230fd9a960567194078f 100644 (file)
--- a/diag.asm
+++ b/diag.asm
@@ -69,19 +69,33 @@ tiles:
        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:
        ; Wait for vblank
        call .vblwait
 
        ld hl, $8000    ; Copy two tiles.
        ld de, tiles
-       ld c, $10
-.cloop:        push hl
-       ld h, d
-       ld l, e
-       ld a, [hl]
+       ld c, $20
+.cloop:        ld a, [de]
        inc de
-       pop hl
        ld [hli], a
        ld [hli], a
        dec c
@@ -93,9 +107,9 @@ 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