NESHawk - implement board UNIF_BMC-GS-2004

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

@@ -640,6 +640,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF-DREAMTECH01.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-190in1.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-A65AS.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-GS-2004.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-T-262.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UxROM.cs">
       <SubType>Code</SubType>

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-190in1.cs

@@ -26,6 +26,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			ser.Sync("reg", ref _reg);
 
 		}
+
 		public override void WritePRG(int addr, byte value)
 		{
 			_reg = (addr >> 2) & 7;

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2004.cs

@@ -0,0 +1,61 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public class UNIF_BMC_GS_2004 : NES.NESBoardBase
+	{
+		private int _reg = 0xFF;
+
+		private int _prgMask32k;
+		private int _wramPage;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "UNIF_BMC-GS-2004":
+					break;
+				default:
+					return false;
+			}
+
+			
+			_prgMask32k = (Cart.prg_size - 8) / 32 - 1;
+
+			// Last 8k of Prg goes into 6000-7FFF 
+			_wramPage = ((Cart.prg_size - 8) / 32) * 0x8000;
+
+			SetMirrorType(EMirrorType.Vertical);
+
+			return true;
+		}
+
+		public override void NESSoftReset()
+		{
+			_reg = 0xFF;
+			base.NESSoftReset();
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("reg", ref _reg);
+
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			_reg = value;
+		}
+
+		public override byte ReadWRAM(int addr)
+		{
+			return ROM[_wramPage + (addr & 0x1FFF)];
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			return ROM[((_reg & _prgMask32k) * 0x8000) + (addr & 0x7FFF)];
+		}
+	}
+}