67 lines
1.5 KiB
C#
67 lines
1.5 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", 255)]
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[HassIssues]
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internal class Mapper255 : Board
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{
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private byte[] RAM;
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internal override string Issues => MNInterfaceLanguage.IssueMapper255;
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internal override void HardReset()
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{
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base.HardReset();
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RAM = new byte[4];
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}
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internal override void WriteEX(ref ushort address, ref byte data)
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{
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if (address >= 22528)
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{
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RAM[address & 3] = (byte)(data & 0xFu);
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}
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}
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internal override void ReadEX(ref ushort address, out byte data)
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{
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if (address >= 22528)
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{
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data = RAM[address & 3];
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}
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else
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{
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data = 0;
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}
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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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Switch08KCHR(address & 0x3F);
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if ((address & 0x1000) == 4096)
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{
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Switch16KPRG((address >> 6) & 0x3F, PRGArea.Area8000);
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Switch16KPRG((address >> 6) & 0x3F, PRGArea.AreaC000);
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}
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else
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{
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Switch32KPRG(((address >> 6) & 0x3F) >> 1, PRGArea.Area8000);
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}
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Switch01KNMTFromMirroring(((address & 0x2000) == 8192) ? 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(RAM);
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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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stream.Read(RAM, 0, RAM.Length);
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}
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}
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}
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