X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/4fd47c85d2419ac8fa788696f7fda03cf3ce8124..09c1936c32d74947896338a1c57270b2918656f8:/diag.asm

diff --git a/diag.asm b/diag.asm
index e9a9f19..d269b25 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
@@ -88,6 +91,9 @@ tiles:
 	db %00000000
 
 putscreen:
+	LD A,$fc		; $001d  Setup BG palette
+	LD [$FF47],A	; $001f
+
 	; Wait for vblank
 	call .vblwait
 
@@ -141,30 +147,19 @@ 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:
@@ -326,8 +321,8 @@ waitsw:
 	ld a,[c]
 	cp $0
 	jr z,.loop1
-.loop2:
-	ld a,[c]
+
+.loop2:	ld a,[c]
 	cp $0
 	jr nz,.loop2
 	ret