From 33b72964d42ee216b02a7c7517173ba8a6e2b2e1 Mon Sep 17 00:00:00 2001
From: adelikat <adelikat@tasvideos.org>
Date: Mon, 7 Nov 2016 17:07:00 -0600
Subject: [PATCH] Mapper 99 - add chr masking, fixes bizhawk crashing on a bad
 dump of VS Super Mario Bros

---
 BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/VS_M99.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/VS_M99.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/VS_M99.cs
index 4fcc6d077d..627c9be4a6 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/VS_M99.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/VS_M99.cs
@@ -63,7 +63,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 		{
 			if (addr < 0x2000)
 			{
-				return VROM[(addr & 0x1FFF) + (NES.VS_chr_reg << 13)];
+				return VROM[(addr & 0x1FFF) + ((NES.VS_chr_reg & chr_mask) << 13)];
 			}
 			else
 			{