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commodore64: D64 loading fills gap bits to meet MNIB standard track lengths

This commit is contained in:
saxxonpike 2012-11-14 04:58:39 +00:00
parent a3db998a0d
commit a8957f1916
1 changed files with 12 additions and 1 deletions
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13
BizHawk.Emulation/Computers/Commodore64/D64.cs
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@ -60,6 +60,11 @@ namespace BizHawk.Emulation.Computers.Commodore64
17, 17, 17, 17, 17 17, 17, 17, 17, 17
}; };
private static int[] standardTrackLengthBytes =
{
6250, 6666, 7142, 7692
};
private static byte Checksum(byte[] source) private static byte Checksum(byte[] source)
{ {
int count = source.Length; int count = source.Length;
@ -221,9 +226,15 @@ namespace BizHawk.Emulation.Computers.Commodore64
byte[] diskData = ConvertSectorToGCR(sectorData, (byte)j, (byte)i, (byte)0x00, (byte)0x00, out bitsWritten); byte[] diskData = ConvertSectorToGCR(sectorData, (byte)j, (byte)i, (byte)0x00, (byte)0x00, out bitsWritten);
trackMem.Write(diskData, 0, diskData.Length); trackMem.Write(diskData, 0, diskData.Length);
} }
track.density = densityTable[i];
// we pad the tracks with extra gap bytes to meet MNIB standards
while (trackMem.Length < standardTrackLengthBytes[track.density])
{
trackMem.WriteByte(0x55);
}
track.data = trackMem.ToArray(); track.data = trackMem.ToArray();
track.bits = (int)trackMem.Length; track.bits = (int)trackMem.Length;
track.density = densityTable[i];
track.index = i; track.index = i;
result.tracks.Add(track); result.tracks.Add(track);
trackMem.Dispose(); trackMem.Dispose();