72 lines
1.6 KiB
C#
72 lines
1.6 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 Mapper240 : NES.NESBoardBase
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{
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//MHROM (mapper60) -like but wider regs (4 prg, 4 chr instead of 2 prg, 2 chr) and on EXP bus
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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 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 "MAPPER240":
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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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prg_bank_32k = 0;
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chr_bank_8k = 0;
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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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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 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[addr + (chr_bank_8k * 0x2000)];
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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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return ROM[addr + (prg_bank_32k * 0x8000)];
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}
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public override void WriteEXP(int addr, byte value)
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{
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//if (ROM != null && bus_conflict) value = HandleNormalPRGConflict(addr, value);
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Console.WriteLine("{0:x4} = {1:x2}", addr + 0x4000, value);
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prg_bank_32k = (value >> 4) & 0xF;
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chr_bank_8k = (value) & 0xF;
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prg_bank_32k &= prg_bank_mask_32k;
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chr_bank_mask_8k &= chr_bank_mask_8k;
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}
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}
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}
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