commodore64: add Domark/HES mapper 0013

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -85,6 +85,7 @@
     <Compile Include="Computers\Commodore64\C64.Input.cs" />
     <Compile Include="Computers\Commodore64\Cartridges\Mapper0005.cs" />
     <Compile Include="Computers\Commodore64\Cartridges\Mapper0012.cs" />
+    <Compile Include="Computers\Commodore64\Cartridges\Mapper0013.cs" />
     <Compile Include="Computers\Commodore64\Cartridges\Mapper0020.cs" />
     <Compile Include="Computers\Commodore64\Media\PRG.cs" />
     <Compile Include="Computers\Commodore64\Memory.cs" />

BizHawk.Emulation/Computers/Commodore64/Cartridges/Cartridge.cs

@@ -73,6 +73,9 @@ namespace BizHawk.Emulation.Computers.Commodore64.Cartridges
 						case 0x0012:
 							result = new Mapper0012(chipAddress, chipBank, chipData);
 							break;
+						case 0x0013:
+							result = new Mapper0013(chipAddress, chipBank, chipData);
+							break;
 						case 0x0020:
 							result = new Mapper0020(chipAddress, chipBank, chipData);
 							break;

BizHawk.Emulation/Computers/Commodore64/Cartridges/Mapper0013.cs

@@ -0,0 +1,119 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Computers.Commodore64.Cartridges
+{
+	// Mapper for a few Domark and HES Australia games.
+	// It seems a lot of people dumping these have remapped
+	// them to the Ocean mapper (0005) but this is still here
+	// for compatibility.
+	//
+	// Bank select is DE00, bit 7 enabled means to disable
+	// ROM in 8000-9FFF.
+
+	public class Mapper0013 : Cartridge
+	{
+		private byte[][] banks = new byte[0][]; //8000
+		private uint bankMask;
+		private uint bankNumber;
+		private byte[] currentBank;
+		private byte[] dummyBank;
+		private bool romEnable;
+
+		public Mapper0013(List<uint> newAddresses, List<uint> newBanks, List<byte[]> newData)
+		{
+			uint count = (uint)newAddresses.Count;
+
+			pinGame = true;
+			pinExRom = false;
+			romEnable = true;
+
+			// build dummy bank
+			dummyBank = new byte[0x2000];
+			for (uint i = 0; i < 0x2000; i++)
+				dummyBank[i] = 0xFF; // todo: determine if this is correct
+
+			if (count == 16) //128k
+			{
+				bankMask = 0x0F;
+				banks = new byte[16][];
+			}
+			else if (count == 8) //64k
+			{
+				bankMask = 0x07;
+				banks = new byte[8][];
+			}
+			else if (count == 4) //32k
+			{
+				bankMask = 0x03;
+				banks = new byte[4][];
+			}
+			else
+			{
+				// we don't know what format this is...
+				throw new Exception("This looks like a Domark/HES cartridge but cannot be loaded...");
+			}
+
+			// for safety, initialize all banks to dummy
+			for (uint i = 0; i < banks.Length; i++)
+				banks[i] = dummyBank;
+
+			// now load in the banks
+			for (int i = 0; i < count; i++)
+			{
+				if (newAddresses[i] == 0x8000)
+				{
+					banks[newBanks[i] & bankMask] = newData[i];
+				}
+			}
+
+			BankSet(0);
+		}
+
+		private void BankSet(uint index)
+		{
+			bankNumber = index & bankMask;
+			romEnable = ((index & 0x80) == 0);
+			UpdateState();
+		}
+
+		public override byte Peek8000(int addr)
+		{
+			return currentBank[addr];
+		}
+
+		public override void PokeDE00(int addr, byte val)
+		{
+			if (addr == 0x00)
+				BankSet(val);
+		}
+
+		public override byte Read8000(ushort addr)
+		{
+			return currentBank[addr];
+		}
+
+		private void UpdateState()
+		{
+			currentBank = banks[bankNumber];
+			if (romEnable)
+			{
+				pinExRom = true;
+				pinGame = true;
+			}
+			else
+			{
+				pinExRom = false;
+				pinGame = true;
+			}
+		}
+
+		public override void WriteDE00(ushort addr, byte val)
+		{
+			if (addr == 0x00)
+				BankSet(val);
+		}
+	}
+}