nes mapper 37: "Super Mario Bros. / Tetris / Nintendo World Cup" licensed multicart (E)

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -198,6 +198,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\MLT-MAX15.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\HKROM.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper012.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper037.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper044.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper049.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper052.cs" />

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper037.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	// mmc3 multi, PAL, "Super Mario Bros. / Tetris / Nintendo World Cup"
+	public class Mapper037 : MMC3Board_Base
+	{
+		int exreg;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER037":
+				case "PAL-ZZ":
+					break;
+				default:
+					return false;
+			}
+			AssertPrg(256);
+			AssertChr(256);
+			BaseSetup();
+			//mmc3.MMC3Type = ??
+			exreg = 0;
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("exreg", ref exreg);
+			base.SyncState(ser);
+		}
+
+		public override void WriteWRAM(int addr, byte value)
+		{
+			if (!mmc3.wram_enable || mmc3.wram_write_protect)
+				return;
+			exreg = value & 7;
+			mmc3.Sync(); // unneeded?
+		}
+
+		protected override int Get_CHRBank_1K(int addr)
+		{
+			return base.Get_CHRBank_1K(addr) | (exreg << 5 & 0x80);
+		}
+
+		protected override int Get_PRGBank_8K(int addr)
+		{
+			return (exreg << 2 & 0x10) | ((exreg & 3) == 3 ? 8 : 0) | (base.Get_PRGBank_8K(addr) & (exreg << 1 | 7));
+		}
+	}
+}