144 lines
2.5 KiB
C#
144 lines
2.5 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 Mapper045 : MMC3Board_Base
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{
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//http://wiki.nesdev.com/w/index.php/INES_Mapper_045
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int chr_bank_mask_2k;
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int prg_bank_mask_8k;
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int cur_reg = 0;
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ByteBuffer regs = new ByteBuffer(4);
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bool lock_regs = false;
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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 "MAPPER045":
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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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BaseSetup();
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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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regs.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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ser.Sync("regs", ref regs);
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ser.Sync("lock_regs", ref lock_regs);
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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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if (lock_regs)
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{
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base.WriteWRAM(addr, value);
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}
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else
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{
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regs[cur_reg] = value;
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IncrementCounter();
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Sync45();
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}
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}
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private void Sync45()
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{
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lock_regs = regs[3].Bit(6);
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}
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private void IncrementCounter()
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{
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if (cur_reg == 3)
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{
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cur_reg = 0;
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}
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else
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{
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cur_reg++;
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}
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}
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public override void NESSoftReset()
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{
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lock_regs = false;
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cur_reg = 0;
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regs = new ByteBuffer(4);
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base.NESSoftReset();
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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 &= (regs[3] & 0x3F) ^ 0x3F;
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bank_8k |= regs[1];
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bank_8k &= prg_mask;
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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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private int CHR_AND()
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{
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switch (regs[2] & 0x0F)
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{
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default:
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case 0:
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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case 7:
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return 0x00;
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case 8:
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return 0x01;
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case 9:
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case 0xA:
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case 0xB:
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case 0xC:
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case 0xD:
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return 0x3F;
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case 0xE:
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return 0x7F;
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case 0xF:
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return 0xFF;
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}
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}
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private int CHR_OR()
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{
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int x = regs[0] | ((regs[2] >> 4) << 8);
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return x;
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}
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protected override int MapCHR(int addr)
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{
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int bank_1k = Get_CHRBank_1K(addr);
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bank_1k &= CHR_AND();
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bank_1k |= CHR_OR();
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bank_1k &= chr_mask;
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addr = (bank_1k << 10) | (addr & 0x3FF);
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return addr;
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}
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}
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}
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