NES - start mapper 52

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -187,6 +187,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper012.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" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper074.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper115.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper182.cs" />

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper052.cs

@@ -0,0 +1,142 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class Mapper52 : MMC3Board_Base
+	{
+		//http://wiki.nesdev.com/w/index.php/INES_Mapper_052
+
+		bool lock_regs = false;
+		bool prg_block_size = false;
+		bool chr_block_size = false;
+		int prg_or = 0;
+		int chr_or = 0;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER052":
+					break;
+				default:
+					return false;
+			}
+
+			BaseSetup();
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("lock_regs", ref lock_regs);
+			ser.Sync("prg_block_size", ref prg_block_size);
+			ser.Sync("chr_block_size", ref chr_block_size);
+			ser.Sync("prg_or", ref prg_or);
+			ser.Sync("chr_or", ref chr_or);
+			base.SyncState(ser);
+		}
+
+		public override void NESSoftReset()
+		{
+			lock_regs = false;
+			prg_block_size = false;
+			chr_block_size = false;
+			prg_or = 0;
+			chr_or = 0;
+			base.NESSoftReset();
+		}
+
+		public override void WriteWRAM(int addr, byte value)
+		{
+			if (lock_regs)
+			{
+				base.WriteWRAM(addr, value);
+			}
+			else
+			{
+				lock_regs = value.Bit(4);
+				prg_block_size = value.Bit(3);
+				chr_block_size = value.Bit(6);
+				int combo = (value >> 2) & 0x01;
+				prg_or = ((value >> 1) & 0x01) << 5;
+				prg_or |= (value & 0x01) << 6;
+				prg_or |= (combo << 7);
+				chr_or = ((value >> 4) & 0x01) << 7;
+				chr_or |= combo << 8;
+				chr_or |= ((value >> 5) & 0x01) << 9;
+			}
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank_8k = Get_PRGBank_8K(addr);
+			bank_8k &= PRG_AND();
+			bank_8k |= PRG_OR();
+			bank_8k &= prg_mask;
+			addr = (bank_8k << 13) | (addr & 0x1FFF);
+			return ROM[addr];
+		}
+
+		private int PRG_AND()
+		{
+			if (prg_block_size)
+			{
+				return 0x0F;
+			}
+			else
+			{
+				return 0x1F;
+			}
+		}
+
+		private int PRG_OR()
+		{
+			if (prg_block_size)
+			{
+				return prg_or;
+			}
+			else
+			{
+				return (prg_or & 0x60);
+			}
+		}
+
+		protected override int MapCHR(int addr)
+		{
+			int bank_1k = Get_CHRBank_1K(addr);
+
+			bank_1k &= CHR_AND();
+			bank_1k |= CHR_OR();
+			bank_1k &= chr_mask;
+			addr = (bank_1k << 10) | (addr & 0x3FF);
+			return addr;
+		}
+
+		private int CHR_AND()
+		{
+			if (chr_block_size)
+			{
+				return 0x7F;
+			}
+			else
+			{
+				return 0xFF;
+			}
+		}
+
+		private int CHR_OR()
+		{
+			if (chr_block_size)
+			{
+				return chr_or;
+			}
+			else
+			{
+				return (chr_or & 0x300);
+			}
+		}
+	}
+}