102 lines
2.1 KiB
C#
102 lines
2.1 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 Mapper078 : NES.NESBoardBase
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{
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bool holydiver;
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int chr;
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int prg_bank_mask_16k;
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byte prg_bank_16k;
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ByteBuffer prg_banks_16k = new ByteBuffer(2);
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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holydiver = false;
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switch (Cart.board_type)
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{
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case "MAPPER079":
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break;
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case "IREM-HOLYDIVER":
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holydiver = true;
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break;
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case "JALECO-JF-16":
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break;
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default:
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return false;
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}
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SetMirrorType(Cart.pad_h, Cart.pad_v);
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prg_bank_mask_16k = (Cart.prg_size / 16) - 1;
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prg_banks_16k[1] = 0xFF;
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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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prg_banks_16k.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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base.SyncState(ser);
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ser.Sync("chr", ref chr);
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ser.Sync("prg_bank_mask_16k", ref prg_bank_mask_16k);
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ser.Sync("prg_bank_16k", ref prg_bank_16k);
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ser.Sync("prg_banks_16k", ref prg_banks_16k);
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ser.Sync("holydiver", ref holydiver);
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}
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void SyncPRG()
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{
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prg_banks_16k[0] = prg_bank_16k;
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}
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public override void WritePRG(int addr, byte value)
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{
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prg_bank_16k = (byte)(value & 7);
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SyncPRG();
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if (value.Bit(3) == false)
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{
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if (holydiver)
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SetMirrorType(EMirrorType.Horizontal);
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else
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SetMirrorType(EMirrorType.OneScreenA);
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}
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else
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{
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if (holydiver)
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SetMirrorType(EMirrorType.Vertical);
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else
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SetMirrorType(EMirrorType.OneScreenB);
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}
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chr = (value >> 4);
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}
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public override byte ReadPRG(int addr)
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{
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int bank_16k = addr >> 14;
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int ofs = addr & ((1 << 14) - 1);
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bank_16k = prg_banks_16k[bank_16k];
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bank_16k &= prg_bank_mask_16k;
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addr = (bank_16k << 14) | 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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return VROM[(addr & 0x1FFF) + (chr * 0x2000)];
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else
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return base.ReadPPU(addr);
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}
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}
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}
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