80 lines
1.7 KiB
C#
80 lines
1.7 KiB
C#
using System;
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using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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//generally mapper66
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//Doraemon
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//Dragon Power
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//Gumshoe
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//Thunder & Lightning
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//Super Mario Bros. + Duck Hunt
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//TODO - bus conflicts
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[NES.INESBoardImplPriority]
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public sealed class GxROM : NES.NESBoardBase
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{
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//configuraton
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int prg_mask, chr_mask;
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//state
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int prg, chr;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//configure
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switch (Cart.board_type)
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{
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case "MAPPER066":
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break;
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case "NES-GNROM": //thunder & lightning
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case "BANDAI-GNROM":
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case "HVC-GNROM":
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case "NES-MHROM": //Super Mario Bros. / Duck Hunt
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AssertPrg(Cart.board_type == "NES-MHROM" ? 64 : 128); AssertChr(8, 16, 32); 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_mask = (Cart.prg_size / 32) - 1;
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chr_mask = (Cart.chr_size / 8) - 1;
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SetMirrorType(Cart.pad_h, Cart.pad_v);
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if(origin == NES.EDetectionOrigin.INES)
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Console.WriteLine("Caution! This board (inferred from iNES) might have wrong mirr.type");
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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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return ROM[addr + (prg<<15)];
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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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return VROM[addr + (chr << 13)];
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}
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else 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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chr = ((value & 3) & chr_mask);
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prg = (((value>>4) & 3) & prg_mask);
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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", ref prg);
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}
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}
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} |