115 lines
1.9 KiB
C#
115 lines
1.9 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 Mapper245 : MMC3Board_Base
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{
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//http://wiki.nesdev.com/w/index.php/INES_Mapper_245
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bool chr_mode;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//analyze board type
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switch (Cart.board_type)
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{
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case "MAPPER245":
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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_mode = false;
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BaseSetup();
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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("chr_mode", ref chr_mode);
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base.SyncState(ser);
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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 = Get_PRGBank_8K(addr);
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bank_8k &= prg_mask;
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bank_8k &= 0x3F;
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int reg0 = ((base.mmc3.chr_regs_1k[0] >> 1) & 0x01);
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if (reg0 == 1)
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{
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addr |= 0x40;
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}
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else
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{
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addr |= 0x00;
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}
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addr = (bank_8k << 13) | (addr & 0x1FFF);
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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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if (addr == 0)
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{
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chr_mode = value.Bit(7);
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}
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base.WritePRG(addr, value);
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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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if (chr_mode)
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{
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if (addr < 0x1000)
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{
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return VRAM[addr + 0x1000];
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}
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else
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{
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return VRAM[addr - 0x1000];
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}
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}
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else
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{
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return VRAM[addr];
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}
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}
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else
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{
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return base.ReadPPU(addr);
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}
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}
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public override void WritePPU(int addr, byte value)
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{
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if (addr < 0x2000)
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{
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if (chr_mode)
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{
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if (addr < 0x1000)
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{
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VRAM[addr + 0x1000] = value;
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}
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else
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{
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VRAM[addr - 0x1000] = value;
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}
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}
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else
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{
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VRAM[addr] = value;
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}
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}
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else
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{
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base.WritePPU(addr, value);
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}
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}
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}
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}
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