From 86cfa69b989191474d2b9f6a8da27f77c2925e40 Mon Sep 17 00:00:00 2001
From: alyosha-tas <alexei.f.k@gmail.com>
Date: Thu, 18 May 2017 16:18:49 -0400
Subject: [PATCH] C64: Add Mapper 0008

---
 .../Commodore64/Cartridge/CartridgeDevice.cs  |   3 +
 .../Commodore64/Cartridge/Mapper0008.cs       | 104 ++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/Mapper0008.cs

diff --git a/BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/CartridgeDevice.cs b/BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/CartridgeDevice.cs
index 478e84ffa7..4ce22ca688 100644
--- a/BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/CartridgeDevice.cs
+++ b/BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/CartridgeDevice.cs
@@ -81,6 +81,9 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.Cartridge
 					case 0x0005:    // Ocean
 						result = new Mapper0005(chipAddress, chipBank, chipData);
 						break;
+					case 0x0008:    // SuperGame
+						result = new Mapper0008(chipData);
+						break;
 					case 0x000A:    // Epyx FastLoad
 						result = new Mapper000A(chipData);
 						break;
diff --git a/BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/Mapper0008.cs b/BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/Mapper0008.cs
new file mode 100644
index 0000000000..a9c1be9960
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Computers/Commodore64/Cartridge/Mapper0008.cs
@@ -0,0 +1,104 @@
+using System;
+using System.Collections.Generic;
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Computers.Commodore64.Cartridge
+{
+	internal sealed class Mapper0008 : CartridgeDevice
+	{
+		private int[,] _banks = new int[4,0x4000]; 
+
+		private int _bankMask;
+		private int _bankNumber;
+		private bool _disabled;
+		private int _latchedval;
+
+		// SuperGame mapper
+		// bank switching is done from DF00
+
+		public Mapper0008(IList<int[]> newData)
+		{
+			pinGame = false;
+			pinExRom = false;
+
+			_bankMask = 0x03;
+			_disabled = false;
+			_latchedval = 0;
+
+			// load data into the banks from the list
+			for (var j = 0; j < 4; j++)
+			{
+				for (var i = 0; i < 0x4000; i++)
+				{
+					_banks[j,i] = newData[j][i];
+				}
+			}
+			BankSet(0);
+		}
+
+		protected override void SyncStateInternal(Serializer ser)
+		{
+			ser.Sync("BankMask", ref _bankMask);
+			ser.Sync("BankNumber", ref _bankNumber);
+			ser.Sync("Disabled", ref _disabled);
+			ser.Sync("Latchedvalue", ref _latchedval);
+		}
+
+		public void BankSet(int index)
+		{
+			if (!_disabled)
+			{
+				_bankNumber = index & _bankMask;
+				pinExRom = (index & 0x4) > 0;
+				pinGame = (index & 0x4) > 0;
+				_disabled = (index & 0x8) > 0;
+				_latchedval = index;
+			}
+		}
+
+		public override int Peek8000(int addr)
+		{
+			return _banks[_bankNumber, addr];
+		}
+
+		public override int PeekA000(int addr)
+		{
+			return _banks[_bankNumber, addr + 0x2000];
+		}
+
+		public override void PokeDF00(int addr, int val)
+		{
+			if (addr == 0)
+				BankSet(val);
+		}
+
+		public override int Read8000(int addr)
+		{
+				return _banks[_bankNumber, addr];
+		}
+
+		public override int ReadA000(int addr)
+		{
+				return _banks[_bankNumber, addr + 0x2000];
+		}
+
+		public override void WriteDF00(int addr, int val)
+		{
+			if (addr == 0)
+				BankSet(val);
+		}
+
+		public override int ReadDF00(int addr)
+		{
+			return _latchedval;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			if (ser.IsReader)
+				BankSet(_bankNumber);
+		}
+	}
+}
+