74 lines
1.5 KiB
C#
74 lines
1.5 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// Crime Busters (Brazil) (Unl)
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internal sealed class Mapper038 : 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(EDetectionOrigin origin)
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{
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switch (Cart.BoardType)
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{
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case "MAPPER038":
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case "UNL-PCI556":
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break;
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default:
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return false;
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}
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AssertPrg(128);
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AssertChr(32);
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AssertVram(0);
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AssertWram(0);
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prg_mask = Cart.PrgSize / 32 - 1;
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chr_mask = Cart.ChrSize / 8 - 1;
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SetMirrorType(Cart.PadH, Cart.PadV);
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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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void writereg(byte value)
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{
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prg = value & 3 & prg_mask;
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chr = (value >> 2) & 3 & chr_mask;
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}
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// the standard way to access this register is at 7000:7fff, but due to
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// hardware design, f000:ffff also works
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public override void WritePrg(int addr, byte value)
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{
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//if ((addr & 0x7000) == 0x7000)
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// writereg(value);
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}
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public override void WriteWram(int addr, byte value)
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{
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if ((addr & 0x1000) == 0x1000)
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writereg(value);
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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(nameof(chr), ref chr);
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ser.Sync(nameof(prg), ref prg);
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}
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}
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}
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