for fun, find a copy of "vs castlevania" with ines header and load it. watch the pretty colors

TODO: Everything

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -248,6 +248,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\VRC6.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\VRC7.cs" />
     <Compile Include="Consoles\Nintendo\NES\BisqAPU.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\VsUnisys.cs" />
     <Compile Include="Consoles\Nintendo\NES\Core.cs" />
     <Compile Include="Consoles\Nintendo\NES\iNES.cs" />
     <Compile Include="Consoles\Nintendo\NES\NES.cs" />

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

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	public class VsUnisys : NES.NESBoardBase
+	{
+
+		// this is a copy of UNROM until i figure out what the hell is going on
+
+		int prg_mask;
+		int vram_byte_mask;
+
+		int prg;
+
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER099":
+					break;
+				default:
+					return false;
+			}
+
+			vram_byte_mask = (Cart.vram_size * 1024) - 1;
+			prg_mask = (Cart.prg_size / 16) - 1;
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+			
+			return true;
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int block = addr >> 14;
+			int page = block == 1 ? prg_mask : prg;
+			int ofs = addr & 0x3FFF;
+			return ROM[(page << 14) | ofs];
+		}
+		public override void WritePRG(int addr, byte value)
+		{
+			prg = value & prg_mask;
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VRAM[addr & vram_byte_mask];
+			}
+			else return base.ReadPPU(addr);
+		}
+
+		public override void WritePPU(int addr, byte value)
+		{
+			if (addr < 0x2000)
+			{
+				VRAM[addr & vram_byte_mask] = value;
+			}
+			else base.WritePPU(addr, value);
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("prg", ref prg);
+		}
+
+	}
+}