From 535f35055d853b02c574bd9722160043999793be Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Fri, 20 Nov 2020 01:15:46 -0800
Subject: [PATCH] GBA I/O: Ignore high bits on IME

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

diff --git a/CHANGES b/CHANGES
index 81f3cacbe..bef7697a9 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,7 @@
 0.8.5: (Future)
 Emulation fixes:
  - ARM: Fix Addressing mode 1 shifter on rs == pc (fixes mgba.io/i/1926)
+ - GBA I/O: Ignore high bits on IME
  - GBA Memory: Mark Famicom Mini games 22 through 28 as non-mirroring
 Other fixes:
  - CMake: Fix build with downstream minizip that exports incompatible symbols
diff --git a/src/gba/io.c b/src/gba/io.c
index 209335ec6..fcc7b37f7 100644
--- a/src/gba/io.c
+++ b/src/gba/io.c
@@ -556,7 +556,7 @@ void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
 			GBATestIRQ(gba, 1);
 			return;
 		case REG_IME:
-			gba->memory.io[REG_IME >> 1] = value;
+			gba->memory.io[REG_IME >> 1] = value & 1;
 			GBATestIRQ(gba, 1);
 			return;
 		case REG_MAX: