From 0700f3d642c05713012e5f073df5884bc008d35c Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Tue, 18 Sep 2018 14:42:07 +0000
Subject: Centered BG3.

---
 main.asm | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

(limited to 'main.asm')

diff --git a/main.asm b/main.asm
index 7ec67d4..e9e36d2 100644
--- a/main.asm
+++ b/main.asm
@@ -56,6 +56,21 @@
 	stz	VMADDH
 	DMA	9,zero,$18,0
 
+	; Clear OAM
+	;
+ClearOAM:
+	stz	OAMADDL
+	stz	OAMADDH
+	INDEX16
+	ldx	#0
+.loop
+	stz	OAMDATA
+	stz	OAMDATA
+	inx
+	cpx	#544/2
+	bne	loop
+	INDEX8
+
 	; Copy 4-colour tiles
 	;
 	stz	VMADDL
@@ -80,6 +95,9 @@
 	;
 	stz	CGADD
 	DMA	0,PaletteData,$22,PaletteDataLen
+	lda	#$80
+	sta	CGADD
+	DMA	0,PaletteData,$22,PaletteDataLen
 
 	; Copy BG3
 	;
@@ -118,9 +136,19 @@ copybg3:
 	lda	#$40
 	sta	BG3SC
 
+	lda	#-52
+	sta	BG3HOFS
+	stz	BG3HOFS
+	lda	#-32
+	sta	BG3VOFS
+	stz	BG3VOFS
+
 	lda	#$0f
 	sta	INIDISP
 
+	lda	#$81
+	sta	NMITIMEN
+
 	; Loop forever.
 Forever:
 	jmp Forever
-- 
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