NesHawk - implement mapper 162

BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj

@@ -623,6 +623,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper147.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper150.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper156.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper162.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper164.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper168.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper170.cs" />

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper162.cs

@@ -0,0 +1,79 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public sealed class Mapper162 : NES.NESBoardBase
+	{
+		private ByteBuffer reg = new ByteBuffer(8);
+		private int prg_bank_mask_32k;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER162":
+				case "UNIF_UNL-FS304":
+					break;
+				default:
+					return false;
+			}
+
+			prg_bank_mask_32k = Cart.prg_size / 32 - 1;
+
+			reg[0] = 3;
+			reg[3] = 7;
+
+			return true;
+		}
+
+		public override void Dispose()
+		{
+			reg.Dispose();
+			base.Dispose();
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("regs", ref reg);
+			base.SyncState(ser);
+		}
+
+		public override void WriteEXP(int addr, byte value)
+		{
+			if (addr >= 0x1000)
+			{
+				reg[(addr >> 8) & 3] = value;
+			}
+			else
+			{
+				base.WriteEXP(addr, value);
+			}
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank = 0;
+			switch (reg[3] & 7)
+			{
+				case 0:
+				case 2:
+					bank = (reg[0] & 0xc) | (reg[1] & 2) | ((reg[2] & 0xf) << 4);
+					break;
+				case 1:
+				case 3:
+					bank = (reg[0] & 0xc) | (reg[2] & 0xf) << 4;
+					break;
+				case 4:
+				case 6:
+					bank = (reg[0] & 0xe) | ((reg[1] >> 1) & 1) | ((reg[2] & 0xf) << 4);
+					break;
+				case 5:
+				case 7:
+					bank = (reg[0] & 0xf) | ((reg[2] & 0xf) << 4);
+					break;
+			}
+
+			return ROM[((bank & prg_bank_mask_32k) << 15) + addr];
+		}
+	}
+}