BizHawk - implement mapper 201

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -157,6 +157,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper180.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" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper203.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper207.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper226.cs" />

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper201.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class Mapper201 : NES.NESBoardBase
+	{
+		/*
+			Here are Disch's original notes:  
+		========================
+		=  Mapper 201          =
+		========================
+
+		Example Games:
+		--------------------------
+		8-in-1
+		21-in-1 (2006-CA) (Unl)
+
+
+		Registers:
+		---------------------------
+
+
+		$8000-FFFF:  A~[.... ....  RRRR RRRR]
+		R = PRG/CHR Reg
+
+
+		CHR Setup:
+		---------------------------
+
+		$0000   $0400   $0800   $0C00   $1000   $1400   $1800   $1C00 
+		+---------------------------------------------------------------+
+		|                             $8000                             |
+		+---------------------------------------------------------------+
+
+
+		PRG Setup:
+		---------------------------
+
+		$8000   $A000   $C000   $E000  
+		+-------------------------------+
+		|             $8000             |
+		+-------------------------------+
+		*/
+
+		public int reg;
+		public int prg_bank_mask_32k;
+		public int chr_bank_mask_8k;
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER201":
+					break;
+				default:
+					return false;
+			}
+			SetMirrorType(EMirrorType.Vertical);
+			prg_bank_mask_32k = Cart.prg_size / 32 - 1;
+			chr_bank_mask_8k = Cart.chr_size / 8 - 1;
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("reg", ref reg);
+			base.SyncState(ser);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			if ((addr & 0x08) > 0)
+			{
+				reg = addr & 0x03;
+			}
+			else
+			{
+				reg = 0;
+			}
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			return ROM[((reg & prg_bank_mask_32k) * 0x8000) + addr];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VROM[((reg & chr_bank_mask_8k) * 0x2000) + addr];
+			}
+			return base.ReadPPU(addr);
+		}
+	}
+}