120 lines
2.6 KiB
C#
120 lines
2.6 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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// behavior pulled from fceux:
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/*
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DIS23C01 DAOU ROM CONTROLLER, Korea
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* Metal Force (K)
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* Buzz and Waldog (K)
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* General's Son (K)
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*/
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public class Mapper156 : NES.NESBoardBase
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{
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int prg_mask;
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int chr_mask;
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int prg;
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int[] chr = new int[8];
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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 "MAPPER156":
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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_mask = Cart.prg_size / 16 - 1;
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chr_mask = Cart.chr_size / 1 - 1;
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SetMirrorType(EMirrorType.OneScreenA);
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return true;
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}
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public override void NESSoftReset()
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{
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for (int i = 0; i < chr.Length; i++)
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chr[i] = 0;
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prg = 0;
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SetMirrorType(EMirrorType.OneScreenA);
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}
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public override byte ReadPRG(int addr)
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{
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if (addr < 0x4000)
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return ROM[addr + (prg << 14)];
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else
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return ROM[(addr & 0x3fff) + (prg_mask << 14)];
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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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return VROM[(addr & 0x3ff) + (chr[addr >> 10] << 10)];
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else
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return base.ReadPPU(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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switch (addr)
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{
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case 0x4000:
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case 0x4001:
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case 0x4002:
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case 0x4003:
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chr[addr & 3] &= 0xff00;
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chr[addr & 3] |= value;
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chr[addr & 3] &= chr_mask;
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break;
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case 0x4004:
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case 0x4005:
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case 0x4006:
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case 0x4007:
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chr[addr & 3] &= 0x00ff;
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chr[addr & 3] |= value << 8;
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chr[addr & 3] &= chr_mask;
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break;
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case 0x4008:
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case 0x4009:
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case 0x400a:
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case 0x400b:
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chr[(addr & 3) + 4] &= 0xff00;
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chr[(addr & 3) + 4] |= value;
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chr[(addr & 3) + 4] &= chr_mask;
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break;
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case 0x400c:
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case 0x400d:
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case 0x400e:
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case 0x400f:
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chr[(addr & 3) + 4] &= 0x00ff;
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chr[(addr & 3) + 4] |= value << 8;
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chr[(addr & 3) + 4] &= chr_mask;
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break;
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case 0x4010:
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prg = value & prg_mask;
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break;
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case 0x4014:
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// is this right??
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if ((value & 1) != 0)
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SetMirrorType(EMirrorType.Vertical);
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else
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SetMirrorType(EMirrorType.Horizontal);
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break;
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}
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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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// do not need to serialize mirroring, as that's handled for us
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for (int i = 0; i < chr.Length; i++)
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ser.Sync("chr" + i, ref chr[i]);
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ser.Sync("prg", ref prg);
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}
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}
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}
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