From df59686cbb04db57bbe6c3453a04130155992bdf Mon Sep 17 00:00:00 2001
From: beirich <beirich@4bbf4f03-6f44-549e-7e59-35d4b0962838>
Date: Sat, 26 May 2012 20:21:00 +0000
Subject: [PATCH] Fix crash in PCE Coryoon when attempting to access disabled
 TurboCD ports

---
 BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs b/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs
index ed65d9e8b9..b31ecc63f7 100644
--- a/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs	
+++ b/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs	
@@ -45,6 +45,8 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
         {
             if (!TurboCD && !BramEnabled)
                 return; // flee if no turboCD hooked up
+            if (!TurboCD && addr != 0x1FF807)
+                return; // only bram port available unless full TurobCD mode.
 
             switch (addr & 0x1FFF)
             {
@@ -189,6 +191,8 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
         {
             if (!TurboCD && !BramEnabled)
                 return 0xFF; //bail if no TurboCD.
+            if (!TurboCD && addr != 0x1FF803) // only allow access to $1803 unless full TurboCD mode.
+                return 0xFF;
 
             byte returnValue = 0;
             short sample;