From 164a6cb42df8eff2a8484136a037ad1957cd17d8 Mon Sep 17 00:00:00 2001
From: goyuken <goyuken@4bbf4f03-6f44-549e-7e59-35d4b0962838>
Date: Sun, 28 Oct 2012 23:53:29 +0000
Subject: [PATCH] nes: gxrom: fix possible crash on 64K prg carts???? maybe?

---
 BizHawk.Emulation/Consoles/Nintendo/NES/Boards/GxROM.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/GxROM.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/GxROM.cs
index 1a3c1bb470..d3a4edbce7 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/GxROM.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/GxROM.cs
@@ -41,7 +41,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 					return false;
 			}
 
-			prg_mask = (Cart.prg_size/8/2) - 1;
+			prg_mask = (Cart.prg_size / 32) - 1;
 			chr_mask = (Cart.chr_size / 8) - 1;
 			SetMirrorType(Cart.pad_h, Cart.pad_v);