91 lines
2.2 KiB
C#
91 lines
2.2 KiB
C#
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using System.IO;
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namespace MyNes.Core
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{
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[BoardInfo("Unknown", 227)]
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internal class Mapper227 : Board
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{
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private bool flag_o;
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private bool flag_s;
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private bool flag_l;
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private int prg_reg;
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internal override void HardReset()
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{
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base.HardReset();
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Switch16KPRG(0, PRGArea.AreaC000);
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flag_o = false;
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flag_s = false;
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flag_l = false;
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prg_reg = 0;
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ToggleCHRRAMWritableEnable(enable: true);
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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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flag_s = (address & 1) == 1;
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flag_o = (address & 0x80) == 128;
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flag_l = (address & 0x200) == 512;
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prg_reg = ((address >> 2) & 0x1F) | ((address >> 3) & 0x20);
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Switch01KNMTFromMirroring(((address & 2) == 2) ? Mirroring.Horz : Mirroring.Vert);
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ToggleCHRRAMWritableEnable(!flag_o);
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if (flag_o)
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{
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if (!flag_s)
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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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}
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else if (!flag_l)
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{
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if (!flag_s)
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{
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Switch16KPRG(prg_reg, PRGArea.Area8000);
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Switch16KPRG(prg_reg & 0x38, PRGArea.AreaC000);
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}
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else
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{
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Switch16KPRG(prg_reg & 0x3E, PRGArea.Area8000);
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Switch16KPRG(prg_reg & 0x38, PRGArea.AreaC000);
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}
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}
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else if (!flag_s)
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{
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Switch16KPRG(prg_reg, PRGArea.Area8000);
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Switch16KPRG(prg_reg | 7, PRGArea.AreaC000);
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}
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else
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{
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Switch16KPRG(prg_reg & 0x3E, PRGArea.Area8000);
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Switch16KPRG(prg_reg | 7, PRGArea.AreaC000);
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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(flag_o);
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stream.Write(flag_s);
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stream.Write(flag_l);
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stream.Write(prg_reg);
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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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flag_o = stream.ReadBoolean();
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flag_s = stream.ReadBoolean();
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flag_l = stream.ReadBoolean();
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prg_reg = stream.ReadInt32();
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}
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}
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}
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