Genesis ROM header parsing

and other stuff thats only committed because svn isn't decentralized!

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -269,6 +269,8 @@
     <Compile Include="Consoles\PC Engine\MemoryMap.Populous.cs" />
     <Compile Include="Consoles\PC Engine\ScsiCDBus.cs" />
     <Compile Include="Consoles\PC Engine\TurboCD.cs" />
+    <Compile Include="Consoles\Sega\Genesis\Cart\RomHeader.cs" />
+    <Compile Include="Consoles\Sega\Genesis\Cart\SaveRAM.cs" />
     <Compile Include="Consoles\Sega\Genesis\Input.cs" />
     <Compile Include="Consoles\Sega\SMS\MemoryMap.CodeMasters.cs" />
     <Compile Include="Consoles\Sega\SMS\MemoryMap.Sega.cs" />

BizHawk.Emulation/Consoles/PC Engine/PCEngine.cs

@@ -209,14 +209,12 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
 			//    it in the least intrusive and most honest way we can.
 
 			if (game["HBlankPeriod"])
-				VDC1.HBlankCycles = int.Parse(game.OptionValue("HBlankPeriod"));
+				VDC1.HBlankCycles = game.GetIntValue("HBlankPeriod");
 
 			// This is also a hack. Proper multi-res/TV emulation will be a native-code core feature.
 
 			if (game["MultiResHack"])
-			{
+				VDC1.MultiResHack = game.GetIntValue("MultiResHack");
-				VDC1.MultiResHack = int.Parse(game.OptionValue("MultiResHack"));
-			}
 
 			Cpu.ResetPC();
 			SetupMemoryDomains();

BizHawk.Emulation/Consoles/Sega/Genesis/Genesis.cs

@@ -130,6 +130,13 @@ namespace BizHawk.Emulation.Consoles.Sega
             MainCPU.Reset();
             VDP.GetPC = () => MainCPU.PC;
 #endif
+            InitializeCartHardware(game);
+        }
+
+        void InitializeCartHardware(GameInfo game)
+        {
+            LogCartInfo();
+            InitializeSaveRam(game);
         }
 
 		public void FrameAdvance(bool render)
@@ -260,22 +267,7 @@ namespace BizHawk.Emulation.Consoles.Sega
 		public bool DeterministicEmulation { get; set; }
 		public string SystemId { get { return "GEN"; } }
 
-		public byte[] ReadSaveRam
+		
-		{
-			get { throw new NotImplementedException(); }
-		}
-
-		public bool SaveRamModified
-		{
-			get
-			{
-				return false; // TODO implement
-			}
-			set
-			{
-				throw new NotImplementedException();
-			}
-		}
 
         public void SaveStateText(TextWriter writer)
         {

BizHawk.Emulation/Consoles/Sega/Genesis/MemoryMap.68000.cs

@@ -8,9 +8,16 @@ namespace BizHawk.Emulation.Consoles.Sega
         {
             address &= 0x00FFFFFF;
 
-            if (address < 0x400000)
+            if (address < 0x200000)
                 return (sbyte) RomData[address];
 
+            if (address < 0x400000)
+            {
+                if (SaveRamEnabled && address >= SaveRamStartOffset && address < SaveRamEndOffset)
+                    return (sbyte) SaveRAM[address - SaveRamStartOffset];
+                return (sbyte)RomData[address];
+            }
+
             if (address >= 0xE00000)
                 return (sbyte) Ram[address & 0xFFFF];
 
@@ -144,6 +151,13 @@ namespace BizHawk.Emulation.Consoles.Sega
                 return;
             }
 
+            if (SaveRamEnabled && address >= SaveRamStartOffset && address < SaveRamEndOffset)
+            {
+                SaveRAM[address - SaveRamStartOffset] = (byte) value;
+                SaveRamModified = true;
+                return;
+            }
+
             Console.WriteLine("UNHANDLED WRITEB {0:X6}:{1:X2}", address, value);
         }
 

BizHawk.Emulation/Database/GameInfo.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using System.Globalization;
 
 namespace BizHawk
 {
@@ -87,6 +88,16 @@ namespace BizHawk
 			return null;
 		}
 
+        public int GetIntValue(string option)
+        {
+            return int.Parse(Options[option]);
+        }
+
+        public int GetHexValue(string option)
+        {
+            return int.Parse(Options[option], NumberStyles.HexNumber);
+        }
+
 		public ICollection<string> GetOptions()
 		{
 			return Options.Keys;