67 lines
1.6 KiB
C#
67 lines
1.6 KiB
C#
using System.IO;
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namespace MyNes.Core
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{
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[BoardInfo("Unknown", 226)]
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internal class Mapper226 : Board
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{
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private int prg_reg;
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private bool prg_mode;
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internal override void HardReset()
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{
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base.HardReset();
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prg_reg = 0;
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prg_mode = false;
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}
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internal override void WritePRG(ref ushort address, ref byte data)
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{
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switch (address & 0x8001)
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{
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case 32768:
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prg_reg = (data & 0x1F) | ((data & 0x80) >> 2) | (prg_reg & 0xC0);
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prg_mode = (data & 0x20) == 32;
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Switch01KNMTFromMirroring(((data & 0x40) == 64) ? Mirroring.Vert : Mirroring.Horz);
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if (prg_mode)
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{
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Switch16KPRG(prg_reg, PRGArea.Area8000);
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Switch16KPRG(prg_reg, PRGArea.AreaC000);
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}
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else
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{
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Switch32KPRG(prg_reg >> 1, PRGArea.Area8000);
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}
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break;
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case 32769:
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prg_reg = ((data & 1) << 6) | (prg_reg & 0x3F);
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if (prg_mode)
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{
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Switch16KPRG(prg_reg, PRGArea.Area8000);
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Switch16KPRG(prg_reg, PRGArea.AreaC000);
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}
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else
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{
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Switch32KPRG(prg_reg >> 1, PRGArea.Area8000);
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}
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break;
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}
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}
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internal override void WriteStateData(ref BinaryWriter stream)
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{
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base.WriteStateData(ref stream);
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stream.Write(prg_reg);
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stream.Write(prg_mode);
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}
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internal override void ReadStateData(ref BinaryReader stream)
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{
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base.ReadStateData(ref stream);
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prg_reg = stream.ReadInt32();
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prg_mode = stream.ReadBoolean();
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}
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}
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}
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