NES - implement mapper 58

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -148,6 +148,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\JALECO_JF_17.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\JALECO_JF_19.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper015.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper058.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper069.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper107.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper116.cs" />

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper058.cs

@@ -0,0 +1,107 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class Mapper058 : NES.NESBoardBase
+	{
+		/*
+		*  Here are Disch's original notes:  
+		========================
+		=  Mapper 058          =
+		========================
+
+		Example Games:
+		--------------------------
+		68-in-1 (Game Star)
+		Study and Game 32-in-1
+
+
+		Registers:
+		---------------------------
+
+		$8000-FFFF:  A~[.... .... MOCC CPPP]
+		P = PRG page select
+		C = CHR page select (8k @ $0000)
+		O = PRG Mode
+		M = Mirroring (0=Vert, 1=Horz)
+
+
+		PRG Setup:
+		---------------------------
+
+					  $8000   $A000   $C000   $E000  
+					+-------------------------------+
+		PRG Mode 0: |            <$8000>            |
+					+-------------------------------+
+		PRG Mode 1: |     $8000     |     $8000     |
+					+---------------+---------------+
+		*/
+
+		bool prg_mode = false;
+		int chr_reg;
+		int prg_reg;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER058":
+					break;
+				default:
+					return false;
+			}
+
+			SetMirrorType(EMirrorType.Vertical);
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("prg_reg", ref prg_reg);
+			ser.Sync("chr_reg", ref chr_reg);
+			ser.Sync("prg_mode", ref prg_mode);
+			base.SyncState(ser);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			prg_mode = addr.Bit(6);
+			if (addr.Bit(7))
+			{
+				SetMirrorType(EMirrorType.Horizontal);
+			}
+			else
+			{
+				SetMirrorType(EMirrorType.Vertical);
+			}
+
+			prg_reg = addr & 0x07;
+			chr_reg = (addr >> 3) & 0x07;
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			if (prg_mode == false)
+			{
+				return ROM[((prg_reg >> 1) * 0x8000) + addr];
+			}
+			else
+			{
+				return ROM[(prg_reg * 0x4000) + (addr & 0x3FFF)];
+			}
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VROM[(chr_reg * 0x2000) + addr];
+			}
+			return base.ReadPPU(addr);
+		}
+	}
+}