From 451c16f4cb00ebb8f03d7fad4fa7b7d46bc60fe5 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Wed, 16 Oct 2013 22:23:32 -0700
Subject: [PATCH] Fix overwriting DISPSTAT with fixed values for the lower bits

---
 src/gba/gba-io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gba/gba-io.c b/src/gba/gba-io.c
index 07d332f30..3ff51f95c 100644
--- a/src/gba/gba-io.c
+++ b/src/gba/gba-io.c
@@ -15,6 +15,7 @@ void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
 		switch (address) {
 		// Video
 		case REG_DISPSTAT:
+			value &= 0xFFF8;
 			GBAVideoWriteDISPSTAT(&gba->video, value);
 			break;