Support King of Fighter 97 (UNIF_UNL-KOF97)

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

@@ -751,6 +751,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_UNL-AX5705.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_UNL-CC-21.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_UNL-EDU2000.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_UNL-KOF97.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_UNL-TF1201.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_UNL_DripGame.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UxROM.cs">

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_UNL-KOF97.cs

@@ -0,0 +1,72 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	// adapted from Nestopia src
+	public sealed class UNIF_UNL_KOF97 : MMC3Board_Base
+	{
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "UNIF_UNL-KOF97":
+					break;
+				default:
+					return false;
+			}
+
+			BaseSetup();
+			return true;
+		}
+
+		private byte Unscramble(byte data)
+		{
+			return (byte)
+			(
+				(data >> 1 & 0x01) |
+				(data >> 4 & 0x02) |
+				(data << 2 & 0x04) |
+				(data >> 0 & 0xD8) |
+				(data << 3 & 0x20)
+			);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			if (addr < 0x1000) // 0x8000 - 0x8FFF
+			{
+				base.WritePRG(addr & 1, Unscramble(value));
+			}
+
+			else if (addr == 0x1000) // 9000 = 8001
+			{
+				base.WritePRG(1, Unscramble(value));
+			}
+
+			else if (addr == 0x2000) // A000 = 8000)
+			{
+				base.WritePRG(0, Unscramble(value));
+			}
+
+			else if (addr == 0x5000) // D000 = C001
+			{
+				base.WritePRG(0x4001, Unscramble(value));
+			}
+
+			else if (addr >= 0x6000 && addr < 0x7000) // 0xE0000 - 0xEFFF
+			{
+				base.WritePRG(addr & 1, Unscramble(value));
+			}
+
+			else if (addr == 0x7000) // F000
+			{
+				base.WritePRG(0x6001, Unscramble(value));
+			}
+
+			else
+			{
+				base.WritePRG(addr, value);
+			}
+		}
+	}
+}