add mapper038: "Crime Busters (Unl).nes" boots but the game requires zapper...

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -152,6 +152,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\JALECO_JF_19.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\JALECO_SS8806.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper015.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper038.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper045.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper057.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper058.cs" />

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper038.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	// Crime Busters (Brazil) (Unl)
+	public class Mapper038 : NES.NESBoardBase
+	{
+		//configuraton
+		int prg_mask, chr_mask;
+		//state
+		int prg, chr;
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER038":
+				case "UNL-PCI556":
+					break;
+				default:
+					return false;
+			}
+			AssertPrg(128);
+			AssertChr(32);
+			AssertVram(0);
+			AssertWram(0);
+			prg_mask = Cart.prg_size / 32 - 1;
+			chr_mask = Cart.chr_size / 8 - 1;
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+			return true;
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			return ROM[addr + (prg << 15)];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VROM[addr + (chr << 13)];
+			}
+			else return base.ReadPPU(addr);
+		}
+
+		void writereg(byte value)
+		{
+			prg = value & 3 & prg_mask;
+			chr = (value >> 2) & 3 & chr_mask;
+		}
+
+		// the standard way to access this register is at 7000:7fff, but due to
+		// hardware design, f000:ffff also works
+		public override void WritePRG(int addr, byte value)
+		{
+			//if ((addr & 0x7000) == 0x7000)
+			//	writereg(value);
+		}
+
+		public override void WriteWRAM(int addr, byte value)
+		{
+			if ((addr & 0x1000) == 0x1000)
+				writereg(value);
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("chr", ref chr);
+			ser.Sync("prg", ref prg);
+		}
+	}
+}