121 lines
2.6 KiB
C#
121 lines
2.6 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 Mapper91 : NES.NESBoardBase
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{
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/*
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*Note: Street Fighter III (Unl) is actually mapper 197. However variations such as Street Fighter III (9 Fighter) and Mari Street Fighter III use this mapper
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//http://wiki.nesdev.com/w/index.php/INES_Mapper_091
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*/
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ByteBuffer chr_regs_2k = new ByteBuffer(4);
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ByteBuffer prg_regs_8k = new ByteBuffer(4);
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int chr_bank_mask_2k, prg_bank_mask_8k;
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MMC3 mmc3;
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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 "MAPPER091":
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break;
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default:
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return false;
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}
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chr_bank_mask_2k = Cart.chr_size / 2 - 1;
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prg_bank_mask_8k = Cart.prg_size / 8 - 1;
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prg_regs_8k[3] = 0xFF;
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prg_regs_8k[2] = 0xFE;
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mmc3 = new MMC3(this, 0x7FFFFFFF);
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return true;
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}
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public override void Dispose()
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{
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prg_regs_8k.Dispose();
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chr_regs_2k.Dispose();
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if(mmc3 != null) mmc3.Dispose();
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base.Dispose();
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}
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public override void SyncState(Serializer ser)
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{
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mmc3.SyncState(ser);
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ser.Sync("prg_regs", ref prg_regs_8k);
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ser.Sync("chr_regs", ref chr_regs_2k);
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base.SyncState(ser);
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}
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public override void WriteWRAM(int addr, byte value)
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{
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switch (addr & 0x7003)
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{
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case 0x0000:
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chr_regs_2k[0] = value;
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break;
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case 0x0001:
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chr_regs_2k[1] = value;
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break;
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case 0x0002:
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chr_regs_2k[2] = value;
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break;
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case 0x0003:
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chr_regs_2k[3] = value;
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break;
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case 0x1000:
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prg_regs_8k[0] = (byte)(value & 0x0F);
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break;
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case 0x1001:
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prg_regs_8k[1] = (byte)(value & 0x0F);
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break;
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case 0x1002: //$7002
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mmc3.WritePRG(0xE000, value);
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break;
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case 0x1003: //$7003
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mmc3.WritePRG(0xC000, 7);
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mmc3.WritePRG(0xC001, value);
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mmc3.WritePRG(0xE001, value);
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break;
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}
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}
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public override void ClockPPU()
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{
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mmc3.ClockPPU();
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}
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public override void AddressPPU(int addr)
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{
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mmc3.AddressPPU(addr);
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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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int bank_2k = (addr >> 11) - 1;
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bank_2k = chr_regs_2k[bank_2k];
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bank_2k &= chr_bank_mask_2k;
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return VROM[(bank_2k * 0x800) + addr];
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}
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return base.ReadPPU(addr);
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}
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public override byte ReadPRG(int addr)
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{
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int bank_8k = addr >> 13;
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bank_8k = prg_regs_8k[bank_8k];
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bank_8k &= prg_bank_mask_8k;
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return ROM[(bank_8k * 0x2000) + (addr & 0x1FFF)];
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}
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}
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}
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