nes: mapper 188 (karaoke studio)

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

@@ -287,6 +287,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper177.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper178.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper180.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper188.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper193.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper200.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper201.cs" />

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper188.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public sealed class Mapper188 : NES.NESBoardBase
+	{
+		// config
+		int prg_16k_mask;
+		// state
+		int prg;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER188":
+					AssertVram(8);
+					AssertChr(0);
+					AssertPrg(128, 256);
+					Cart.wram_size = 0;
+					break;
+				default:
+					return false;
+			}
+
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+			prg_16k_mask = Cart.prg_size / 16 - 1;
+			return true;
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			prg = value;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("prg", ref prg);
+			base.SyncState(ser);
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank = prg;
+			if (addr >= 0x4000)
+				bank = 15;
+			bank ^= 8; // bad dumps?
+			bank &= prg_16k_mask;
+			return ROM[addr & 0x3fff | bank << 14];
+		}
+
+		public override byte ReadWRAM(int addr)
+		{
+			return 3;
+		}
+	}
+}