NEShawk - start mapper 6

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

@@ -484,6 +484,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\CoolBoy.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\DatachBarcode.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Farid-UNROM-8-in-1.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\FFE\Mapper006.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\FS304.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\GameGenie.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\inlnsf.cs" />

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/FFE/Mapper006.cs

@@ -0,0 +1,115 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public class Mapper006 : NES.NESBoardBase
+	{
+		private int _reg;
+		private int IRQa, mirr;
+		private int IRQCount, IRQLatch;
+
+		private int _prgMask16k;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER006":
+					Cart.vram_size = 32;
+					break;
+				default:
+					return false;
+			}
+
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+
+			_prgMask16k = Cart.prg_size / 16 - 1;
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("reg", ref _reg);
+		}
+
+		public override void WriteEXP(int addr, byte value)
+		{
+			// Mirroring
+			if (addr == 0x2FE || addr == 0x2FF)
+			{
+				int mirr = ((addr << 1) & 2) | ((addr >> 4) & 1);
+				SetMirror(mirr);
+			}
+			// IRQ
+			else if (addr >= 0x500 && addr <= 0x503)
+			{
+				switch (addr)
+				{
+					case 0x501:
+						break;
+					case 0x502:
+						break;
+					case 0x503:
+						break;
+
+				}
+			}
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			_reg = value;
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank = addr < 0x4000
+				? (_reg >> 2) & 0x3F
+				: 7;
+			bank &= _prgMask16k;
+
+			return ROM[(bank * 0x4000) + (addr & 0x3FFF)];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VRAM[((_reg & 3) * 0x2000) + (addr & 0x1FFF)];
+			}
+
+			return base.ReadPPU(addr);
+		}
+
+		public override void WritePPU(int addr, byte value)
+		{
+			if (addr < 0x2000)
+			{
+				VRAM[((_reg & 3) * 0x2000) + (addr & 0x1FFF)] = value;
+			}
+
+			base.WritePPU(addr, value);
+		}
+
+		private void SetMirror(int mirr)
+		{
+			switch (mirr)
+			{
+				case 0:
+					SetMirrorType(EMirrorType.OneScreenA);
+					break;
+				case 1:
+					SetMirrorType(EMirrorType.OneScreenB);
+					break;
+				case 2:
+					SetMirrorType(EMirrorType.Vertical);
+					break;
+				case 3:
+					SetMirrorType(EMirrorType.Horizontal);
+					break;
+			}
+		}
+	}
+}