Creating an 8-inch floppy from 3.5-inch Teledisk image

When writing an image back to a drive, TeleDisk doesn't really care about anything more than the density (low or high), recording mode (FM/MFM), and number and size of sectors. Gap computation is performed on the basis of the drive being used to write. So declare your drive as either a 5.25" 1.2MB or an 8" to TeleDisk and you'll be fine, assuming your controller will write FM. Either way, the track computation will be based on 500K data rate and a 360 RPM drive. As far as the 82 cylinders goes; it's the number used for the maximum track inspected by TeleDisk--TD will keep looking up to track 82 (or 42 for a 48 tpi drive) or (79 for an 8" drive) until no data is returned. Some drives will hit a mechanical stop at track 80 or so, so the positioner will just bounce against it, returning the same data. On playback, the same thing will happen, so you'll get a valid recreation. Things had to be this way because some copy-protected formats use up to 42/82 cylinders; and some customers wanted to recover manufacturing information if present (which is typically recorded on track 40 or 80). Hope this clears things up. Cheers, Chuck