80 lines
1.7 KiB
C#
80 lines
1.7 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("11-in-1", 51)]
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internal class Mapper051 : Board
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{
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private int bank;
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private int mode = 1;
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private int offset;
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internal override void HardReset()
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{
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base.HardReset();
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bank = 0;
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mode = 1;
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offset = 0;
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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 & 0xE000)
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{
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case 32768:
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case 57344:
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bank = data & 0xF;
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UpdateBanks();
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break;
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case 49152:
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bank = data & 0xF;
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mode = ((data >> 3) & 2) | (mode & 1);
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UpdateBanks();
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break;
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}
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}
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internal override void WriteSRM(ref ushort address, ref byte data)
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{
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mode = ((data >> 3) & 2) | ((data >> 1) & 1);
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UpdateBanks();
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}
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private void UpdateBanks()
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{
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offset = 0;
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if ((mode & 1) == 1)
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{
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Switch32KPRG(bank, PRGArea.Area8000);
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offset = 35;
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}
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else
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{
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Switch08KPRG((bank << 1) | (mode >> 1), PRGArea.Area8000);
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Switch08KPRG((bank << 1) | 7, PRGArea.Area8000);
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offset = 47;
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}
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Switch08KPRG(offset | (bank << 2), PRGArea.Area6000);
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Switch01KNMTFromMirroring((mode == 3) ? Mirroring.Horz : Mirroring.Vert);
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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(bank);
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stream.Write(mode);
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stream.Write(offset);
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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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bank = stream.ReadInt32();
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mode = stream.ReadInt32();
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offset = stream.ReadInt32();
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}
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}
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}
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