From afbde96fe57774238115e3e8a766cff4751b3601 Mon Sep 17 00:00:00 2001
From: adelikat <adelikat@tasvideos.org>
Date: Fri, 20 Jul 2012 02:57:46 +0000
Subject: [PATCH] NES - fix some chr mapping logic in Mapper 57

---
 BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper057.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper057.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper057.cs
index 8281d9e792..cf97f6d386 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper057.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper057.cs
@@ -83,13 +83,16 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 		{
 			if (addr == 0)
 			{
-				chr_reg = (value & 0x07) | ((value & 0x40) >> 3);
+				chr_reg |= value & 0x07;
+				chr_reg &= ~0x08;
+				chr_reg &= (value & 0x40) >> 3;
 			}
 			else if ((addr & 0x800) > 0)
 			{
 				prg_reg = (value >> 5) & 0x07;
 				prg_mode = value.Bit(4);
 				chr_reg |= (value & 0x07);
+
 				if (addr.Bit(3))
 				{
 					SetMirrorType(EMirrorType.Horizontal);