124 lines
2.9 KiB
C#
124 lines
2.9 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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//AKA mapper 75
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public class VRC1 : NES.NESBoardBase
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{
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//configuration
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int prg_bank_mask_8k;
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int chr_bank_mask_4k;
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//state
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IntBuffer prg_banks_8k = new IntBuffer(4);
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IntBuffer chr_banks_4k = new IntBuffer(2);
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int[] chr_regs_4k = new int[2];
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public override void Dispose()
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{
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base.Dispose();
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prg_banks_8k.Dispose();
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chr_banks_4k.Dispose();
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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_banks_8k", ref prg_banks_8k);
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ser.Sync("chr_banks_4k", ref chr_banks_4k);
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for (int i = 0; i < 2; i++) ser.Sync("chr_regs_4k_" + i, ref chr_regs_4k[i]);
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if (ser.IsReader)
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{
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SyncCHR();
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}
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}
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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 "MAPPER075":
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break;
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case "KONAMI-VRC-1":
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AssertPrg(128); AssertChr(128); AssertVram(0); AssertWram(0);
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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_8k = Cart.prg_size / 8 - 1;
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chr_bank_mask_4k = Cart.chr_size / 4 - 1;
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SetMirrorType(EMirrorType.Vertical);
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prg_banks_8k[3] = (byte)(0xFF & prg_bank_mask_8k);
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return true;
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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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int ofs = addr & ((1 << 13) - 1);
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bank_8k = prg_banks_8k[bank_8k];
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addr = (bank_8k << 13) | ofs;
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return ROM[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_4k = addr >> 12;
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int ofs = addr & ((1 << 12) - 1);
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bank_4k = chr_banks_4k[bank_4k];
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bank_4k &= chr_bank_mask_4k;
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addr = (bank_4k << 12) | 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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void SyncCHR()
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{
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chr_banks_4k[0] = chr_regs_4k[0] & chr_bank_mask_4k;
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chr_banks_4k[1] = chr_regs_4k[1] & chr_bank_mask_4k;
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}
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public override void WritePRG(int addr, byte value)
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{
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switch (addr)
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{
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case 0x0000: prg_banks_8k[0] = (value & 0xF) & prg_bank_mask_8k; break;
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case 0x2000: prg_banks_8k[1] = (value & 0xF) & prg_bank_mask_8k; break;
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case 0x4000: prg_banks_8k[2] = (value & 0xF) & prg_bank_mask_8k; break;
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case 0x1000: //[.... .BAM] Mirroring, CHR reg high bits
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if(value.Bit(0))
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SetMirrorType(NES.NESBoardBase.EMirrorType.Horizontal);
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else
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SetMirrorType(NES.NESBoardBase.EMirrorType.Vertical);
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chr_regs_4k[0] &= 0x0F;
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chr_regs_4k[1] &= 0x0F;
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if (value.Bit(1)) chr_regs_4k[0] |= 0x10;
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if (value.Bit(2)) chr_regs_4k[1] |= 0x10;
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SyncCHR();
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break;
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case 0x6000:
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chr_regs_4k[0] = (chr_regs_4k[0] & 0xF0) | (value & 0x0F);
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SyncCHR();
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break;
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case 0x7000:
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chr_regs_4k[1] = (chr_regs_4k[1] & 0xF0) | (value & 0x0F);
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SyncCHR();
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break;
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}
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}
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}
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} |