From 47324f87016d611a74b701dad756fb45ebd197aa Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sat, 13 Feb 2016 00:56:22 -0800
Subject: [PATCH] GB Audio: Fix NR41 while disabled

---
 src/gb/audio.c | 3 +--
 src/gb/io.c    | 7 ++-----
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/src/gb/audio.c b/src/gb/audio.c
index c3f24a50a..9c39fb812 100644
--- a/src/gb/audio.c
+++ b/src/gb/audio.c
@@ -376,7 +376,7 @@ void GBAudioWriteNR52(struct GBAudio* audio, uint8_t value) {
 		GBAudioWriteNR32(audio, 0);
 		GBAudioWriteNR33(audio, 0);
 		GBAudioWriteNR34(audio, 0);
-		GBAudioWriteNR41(audio, 0);
+		// Don't write to NR41
 		GBAudioWriteNR42(audio, 0);
 		GBAudioWriteNR43(audio, 0);
 		GBAudioWriteNR44(audio, 0);
@@ -397,7 +397,6 @@ void GBAudioWriteNR52(struct GBAudio* audio, uint8_t value) {
 			audio->p->memory.io[REG_NR32] = 0;
 			audio->p->memory.io[REG_NR33] = 0;
 			audio->p->memory.io[REG_NR34] = 0;
-			audio->p->memory.io[REG_NR41] = 0;
 			audio->p->memory.io[REG_NR42] = 0;
 			audio->p->memory.io[REG_NR43] = 0;
 			audio->p->memory.io[REG_NR44] = 0;
diff --git a/src/gb/io.c b/src/gb/io.c
index add47e8d5..463d2795e 100644
--- a/src/gb/io.c
+++ b/src/gb/io.c
@@ -184,11 +184,8 @@ void GBIOWrite(struct GB* gb, unsigned address, uint8_t value) {
 		}
 		break;
 	case REG_NR41:
-		if (gb->audio.enable) {
-			GBAudioWriteNR41(&gb->audio, value);
-		} else {
-			value = 0;
-		}
+		// NR41 is exempt, for some reason
+		GBAudioWriteNR41(&gb->audio, value);
 		break;
 	case REG_NR42:
 		if (gb->audio.enable) {