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 ++++++++++++++++++++++++++++
 maps.asm | 22 +++++++++++-----------
 2 files changed, 39 insertions(+), 11 deletions(-)

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
diff --git a/maps.asm b/maps.asm
index 597019b..5bb3e1f 100644
--- a/maps.asm
+++ b/maps.asm
@@ -29,23 +29,23 @@
 	bank    2
 
 BG3Map:
-	db 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,0,0,0,0,0,0,0,0,0,0,0,0
-	db 20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,0,0,0,1,40,40,40,40,0,0,40,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,0,0,0,0,1,40,0,40,0,0,40,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,0,0,0,0,1,40,0,40,0,0,40,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,0,0,0,0,1,40,0,40,40,40,40,40,40,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,21,16,19,15,2,5,16,0,13,16,24,0,13,6,23,6,13,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,0,0,0,0,30,28,29,36,0,10,2,15,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,0,0,39,39,39,39,0,0,39,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,0,0,0,39,0,39,0,0,39,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,0,0,0,39,0,39,0,0,39,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,0,0,0,39,0,39,39,39,39,39,39,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,0,0,15,16,5,5,26,3,16,25,39,4,16,39,22,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,20,15,18,14,1,4,15,0,12,15,23,0,12,5,22,5,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,0,0,29,27,28,35,0,9,1,14,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,0,0,16,19,10,8,10,15,2,13,0,8,2,14,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-	db 0,38,29,37,36,32,0,4,16,20,21,2,0,17,2,15,2,26,10,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,14,15,4,4,25,2,15,24,38,3,15,38,21,11,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,0,0,15,18,9,7,9,14,1,12,0,7,1,13,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+	db 0,37,28,36,35,31,0,3,15,19,20,1,0,16,1,14,1,25,9,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 	db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-- 
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