[NES] mapper 240 support

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -82,6 +82,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Jaleco-JF_11_14.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper069.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper107.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper240.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper242.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\DRROM.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper095.cs" />

BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt

@@ -121,7 +121,7 @@ Open bus and bus conflict emulation is not considered complete or thorough in an
 232	Camerica	Complete
 233	Multicart	Junk
 234	Misc		Nothing
-240	Misc (CN)	Nothing
+240	Misc (CN)	Complete
 242	Misc (CN)	Complete
 243	Misc		Nothing
 245	Pirate		Junk

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper240.cs

@@ -0,0 +1,71 @@
+using System;
+using System.IO;
+using System.Diagnostics;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class Mapper240 : NES.NESBoardBase
+	{
+		//MHROM (mapper60) -like but wider regs (4 prg, 4 chr instead of 2 prg, 2 chr) and on EXP bus
+
+		//configuration
+		int prg_bank_mask_32k, chr_bank_mask_8k;
+
+		//state
+		int prg_bank_32k, chr_bank_8k;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			//configure
+			switch (Cart.board_type)
+			{
+				case "MAPPER240":
+					break;
+				default:
+					return false;
+			}
+
+			prg_bank_mask_32k = Cart.prg_size / 32 - 1;
+			chr_bank_mask_8k = Cart.chr_size / 8 - 1;
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+
+			prg_bank_32k = 0;
+			chr_bank_8k = 0;
+
+			return true;
+		}
+
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("prg_bank_32k", ref prg_bank_32k);
+			ser.Sync("chr_bank_8k", ref chr_bank_8k);
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VROM[addr + (chr_bank_8k * 0x2000)];
+			}
+			else return base.ReadPPU(addr);
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			return ROM[addr + (prg_bank_32k * 0x8000)];
+		}
+
+		public override void WriteEXP(int addr, byte value)
+		{
+			//if (ROM != null && bus_conflict) value = HandleNormalPRGConflict(addr, value);
+			Console.WriteLine("{0:x4} = {1:x2}", addr + 0x4000, value);
+			prg_bank_32k = (value >> 4) & 0xF;
+			chr_bank_8k = (value) & 0xF;
+			prg_bank_32k &= prg_bank_mask_32k;
+			chr_bank_mask_8k &= chr_bank_mask_8k;
+		}
+
+	}
+}

BizHawk.Emulation/Consoles/Nintendo/NES/iNES.cs

@@ -102,9 +102,9 @@ static string ClassifyTable = @"
 79	-1	-1	-1	-1	AVE-NINA-06; Blackjack (U)
 113	-1	-1	-1	-1	AVE-NINA-06; ???
 232	-1	-1	-1	-1	CAMERICA-ALGQ; Quattro Adventure
+240	-1	-1	-1	-1	MAPPER240
 ";
 }
-//;232	-1	-1	-1	-1	Camerica_BF9096-FLEX; Quattro Adventure
 
 		unsafe struct iNES_HEADER
 		{