From 5e83510d1a574b37d6aa833c0a842e1170f12a08 Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@zeromus.org>
Date: Mon, 18 Apr 2011 23:01:29 +0000
Subject: [PATCH]

---
 BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs
index b72ca1a6b9..ca24376ab7 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs
@@ -47,8 +47,8 @@ mirroring - both
 
         public override void WriteWRAM(int addr, byte value)
         {
-            int mirror = (addr & 0x01);
-            prg = (addr & 0x7F) >> 3;
+            mirror = ((addr>>1) & 0x01);
+			prg = (addr >> 3) & 15;
 			if (mirror == 1) SetMirrorType(NES.NESBoardBase.EMirrorType.Horizontal);
 			else SetMirrorType(NES.NESBoardBase.EMirrorType.Vertical);
         }