81 lines
1.8 KiB
C#
81 lines
1.8 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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//game=shanghai ; chip=sunsoft-2 ; pcb=SUNSOFT-3R
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//game=fantasy zone ; chip=sunsoft-1 ; pcb = SUNSOFT-4
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//this is confusing. see docs/sunsoft.txt
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class Sunsoft2_Mapper93 : NES.NESBoardBase
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{
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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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switch (Cart.board_type)
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{
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case "MAPPER093":
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break;
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case "SUNSOFT-2":
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if (Cart.pcb != "SUNSOFT-3R") return false;
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break;
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case "SUNSOFT-1":
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if (Cart.pcb != "SUNSOFT-4") return false;
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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("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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}
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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 >> 4) & 15);
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SyncPRG();
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if (value.Bit(0))
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SetMirrorType(EMirrorType.Horizontal);
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else
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SetMirrorType(EMirrorType.Vertical);
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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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}
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}
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