Implement mapper 60

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -167,6 +167,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper078.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper046.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper246.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper60.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\HKROM.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper012.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper044.cs" />

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper60.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class Mapper60 : NES.NESBoardBase
+	{
+		/*
+		Here are Disch's original notes:  
+		========================
+		=  Mapper 060          =
+		========================
+
+		Example Game:
+		--------------------------
+		Reset Based 4-in-1
+
+
+		Notes:
+		---------------------------
+		This mapper is very, very unique.
+
+		It's a multicart that consists of four NROM games, each with 16k PRG (put at $8000 and $C000) and 8k CHR.
+		The current block that is selected is determined by an internal register that can only be incremented by a
+		soft reset!
+
+		I would assume the register is 2 bits wide?  Don't know for sure.
+		*/
+
+		int reg = 0;
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER060":
+					break;
+				default:
+					return false;
+			}
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("reg", ref reg);
+			base.SyncState(ser);
+		}
+
+		public override void NESSoftReset()
+		{
+			if (reg >= 3)
+			{
+				reg = 0;
+			}
+			else
+			{
+				reg++;
+			}
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			if (addr >= 0x4000)
+			{
+				addr -= 0x4000;
+			}
+			return ROM[addr + (reg * 0x4000)];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VROM[(reg * 0x2000) + addr];
+			}
+			return base.ReadPPU(addr);
+		}
+	}
+}