From e112e8671512c3ab716a343bb28e361e21db7b28 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Tue, 14 Apr 2015 20:45:44 -0700
Subject: [PATCH] GBA: Add initial I/O register settings for background matrix
 registers

---
 CHANGES      | 1 +
 src/gba/io.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/CHANGES b/CHANGES
index c02661f9a..9f3a66fe4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -19,6 +19,7 @@ Bugfixes:
  - Qt: Fix window not regaining focus after exiting savestate window
  - Qt: Fix regression where video would not record if the game had already started
  - GBA: Fix rewind boundary conditions
+ - GBA: Add initial I/O register settings for background matrix registers
 Misc:
  - Qt: Show multiplayer numbers in window title
 
diff --git a/src/gba/io.c b/src/gba/io.c
index cdb4f3094..be36e13c5 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -286,6 +286,10 @@ void GBAIOInit(struct GBA* gba) {
 	gba->memory.io[REG_RCNT >> 1] = RCNT_INITIAL;
 	gba->memory.io[REG_KEYINPUT >> 1] = 0x3FF;
 	gba->memory.io[REG_SOUNDBIAS >> 1] = 0x200;
+	gba->memory.io[REG_BG2PA >> 1] = 0x100;
+	gba->memory.io[REG_BG2PD >> 1] = 0x100;
+	gba->memory.io[REG_BG3PA >> 1] = 0x100;
+	gba->memory.io[REG_BG3PD >> 1] = 0x100;
 }
 
 void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {