/// <summary>
/// Searches for the requested sector
/// </summary>
/// <returns></returns>
private FloppyDisk.Sector GetSector()
{
FloppyDisk.Sector sector = null;
// get the current track
var trk = ActiveDrive.Disk.DiskTracks[ActiveDrive.TrackIndex];
// get the current sector index
int index = ActiveDrive.SectorIndex;
// make sure this index exists
if (index > trk.Sectors.Length)
{
index = 0;
}
// index hole count
int iHole = 0;
// loop through the sectors in a track
// the loop ends with either the sector being found
// or the index hole being passed twice
while (iHole <= 2)
{
// does the requested sector match the current sector
if (trk.Sectors[index].SectorIDInfo.C == ActiveCommandParams.Cylinder &&
trk.Sectors[index].SectorIDInfo.H == ActiveCommandParams.Head &&
trk.Sectors[index].SectorIDInfo.R == ActiveCommandParams.Sector &&
trk.Sectors[index].SectorIDInfo.N == ActiveCommandParams.SectorSize)
{
// sector has been found
sector = trk.Sectors[index];
UnSetBit(SR2_BC, ref Status2);
UnSetBit(SR2_WC, ref Status2);
break;
}
// check for bad cylinder
if (trk.Sectors[index].SectorIDInfo.C == 255)
{
SetBit(SR2_BC, ref Status2);
}
// check for no cylinder
else if (trk.Sectors[index].SectorIDInfo.C != ActiveCommandParams.Cylinder)
{
SetBit(SR2_WC, ref Status2);
}
// incrememnt sector index
index++;
// have we reached the index hole?
if (trk.Sectors.Length <= index)
{
// wrap around
index = 0;
iHole++;
}
}
// search loop has completed and the sector may or may not have been found
// bad cylinder detected?
if (Status2.Bit(SR2_BC))
{
// remove WC
UnSetBit(SR2_WC, ref Status2);
}
// update sectorindex on drive
ActiveDrive.SectorIndex = index;
return(sector);
}
