X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/0dea04d38b6864e9734f5a0e556cc088887835bd..f356a7356f41bc0681ac3e3013d8cf335c9e8423:/diag.asm

diff --git a/diag.asm b/diag.asm
index 77c5202..668452d 100644
--- a/diag.asm
+++ b/diag.asm
@@ -33,6 +33,9 @@ main:
 	ld hl, signon
 	call puts
 
+	ld a, $91
+	ld [$FF40], a
+
 	call putscreen
 	
 	ei
@@ -51,22 +54,40 @@ 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:
@@ -75,13 +96,9 @@ putscreen:
 
 	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 +110,9 @@ 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 $9C
@@ -127,30 +144,19 @@ vbl:
 	ld [$FF0F], a
 
 	ld a, [$FF51]
-	ld b, a
-	and $80
-	cp $80
-	jr nz, .nothing
-	ld c, $0
+	bit 7, a
+	jr z, .nothing
 
-	ld a, b
-	and $1
-	cp c
+	bit 0, a
 	call nz, .scyup
 	
-	ld a, b
-	and $2
-	cp c
+	bit 1, a
 	call nz, .scydown
 	
-	ld a, b
-	and $4
-	cp c
+	bit 2, a
 	call nz, .scxup
 	
-	ld a, b
-	and $8
-	cp c
+	bit 3, a
 	call nz, .scxdown
 
 .nothing: