From a76ea9c5207e163869f978e7ced7f4ba5f3e4532 Mon Sep 17 00:00:00 2001
From: beirich <beirich@4bbf4f03-6f44-549e-7e59-35d4b0962838>
Date: Sun, 4 Mar 2012 19:37:00 +0000
Subject: [PATCH] pce: fix a crash when a HuCard accessing invalid addresses
 would venture into TurboCD ports (namely, Rastan Saga)

---
 BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs b/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs
index 294582ef47..ed65d9e8b9 100644
--- a/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs	
+++ b/BizHawk.Emulation/Consoles/PC Engine/TurboCD.cs	
@@ -43,6 +43,9 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
 
         void WriteCD(int addr, byte value)
         {
+            if (!TurboCD && !BramEnabled)
+                return; // flee if no turboCD hooked up
+
             switch (addr & 0x1FFF)
             {
                 case 0x1800: // SCSI Drive Control Line
@@ -184,6 +187,9 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
 
         public byte ReadCD(int addr)
         {
+            if (!TurboCD && !BramEnabled)
+                return 0xFF; //bail if no TurboCD.
+
             byte returnValue = 0;
             short sample;