82 lines
1.7 KiB
C#
82 lines
1.7 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// Doki Doki Panic (FDS port)
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// "BTL 2708"
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public sealed class Mapper103 : NES.NESBoardBase
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{
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int prg;
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bool romenable;
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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 "MAPPER103": // ines identification
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Cart.wram_size = 16;
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Cart.vram_size = 8;
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AssertPrg(128);
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break;
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case "BTL-2708": // ??
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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(EMirrorType.Vertical);
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return true;
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}
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public override void WriteWRAM(int addr, byte value)
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{
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// writes always go to wram, even if rom is mapped in for read
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WRAM[addr] = value;
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}
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public override byte ReadWRAM(int addr)
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{
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if (romenable)
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return ROM[addr | prg << 13];
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else
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return WRAM[addr];
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}
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public override byte ReadPRG(int addr)
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{
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if (!romenable && addr >= 0x3800 && addr < 0x5800)
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return WRAM[addr - 0x1800];
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else
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return ROM[addr | 0x18000];
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}
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public override void WritePRG(int addr, byte value)
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{
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if (addr >= 0x3800 && addr < 0x5800)
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WRAM[addr - 0x1800] = value;
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else
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{
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switch (addr & 0x7000)
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{
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case 0x0000:
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prg = value & 15;
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break;
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case 0x6000:
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SetMirrorType((value & 8) != 0 ? EMirrorType.Horizontal : EMirrorType.Vertical);
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break;
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case 0x7000:
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romenable = (value & 16) != 0;
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break;
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}
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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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ser.Sync("romenable", ref romenable);
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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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