70 lines
1.5 KiB
C#
70 lines
1.5 KiB
C#
using System;
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using System.IO;
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using System.Diagnostics;
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namespace BizHawk.Emulation.Consoles.Nintendo
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{
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class Mapper107 : NES.NESBoardBase
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{
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//configuration
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int prg_bank_mask_32k, chr_bank_mask_8k;
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//state
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int prg_bank_32k, chr_bank_8k;
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public override void SyncState(Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("prg_bank_32k", ref prg_bank_32k);
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ser.Sync("chr_bank_8k", ref chr_bank_8k);
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}
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//configure
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switch (Cart.board_type)
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{
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case "MAPPER107":
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AssertPrg(128); AssertChr(64); AssertWram(8); AssertVram(0); AssertBattery(false);
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break;
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default:
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return false;
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}
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prg_bank_mask_32k = (Cart.prg_size / 32) - 1;
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chr_bank_mask_8k = (Cart.chr_size / 8) - 1;
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SetMirrorType(Cart.pad_h, Cart.pad_v);
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return true;
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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 ofs = addr & ((1 << 13) - 1);
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addr = (chr_bank_8k << 13) | ofs;
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return VROM[addr];
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}
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else 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 ofs = addr & ((1 << 15) - 1);
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addr = (prg_bank_32k << 15) | ofs;
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return ROM[addr];
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}
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public override void WritePRG(int addr, byte value)
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{
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chr_bank_8k = value;
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prg_bank_32k = value >> 1;
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chr_bank_8k &= chr_bank_mask_8k;
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prg_bank_32k &= prg_bank_mask_32k;
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}
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}
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}
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