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