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

I took a look at the archive in question - here's what I could figure out: I first tried TDCHECK from TD2.15 - this reports that it's reading side 128 which seems really wrong. Noting that it also said the image was made with TD2.1, I tried TD2.11 (closest I have) and it did report that it was reading side 0 and side 1 ... so If you do try and recreate it, I would suggest using TD2.1x It also reports FM on a 3.5" drive with 26 sectors/track. 3.5" drives normally operate at 300rpm. An 8" drive operates at 360 rpm, and normally has 26 FM sectors on a track. If the image were truly on a 300 rpm drive, I would expect to see more sectors. So the sectors match an 8" drive. Teledisk tries to describe it's disks in terms of PC drives, and since a PC doesn't have a specification for an 8" drive, it would have had to be manually set up - My guess is that whomever made those images didn't have the drives set up correctly. TD probably thought it was talking to a 300rpm drive, but the # sectors makes me thing it was actually a 360 rpm drive. Unfortunately it may not work backwards - TeleDisk has to calculate the gaps based on total number of bits/track and I assume it will determine this from what it thinks the drive RPM is... I might work ... doesn't hurt to try. If it doesn't, you might be able to write it to a 3.5" disk, read that into IMD and write it out to a 8". Also concerneing is the fact that TDCHECK is reporting 82 tracks - does the Altos have special drives with more tracks? - I've seen people try to get an extra track or two, but 5 tracks past the end of the drive (8" = 77 tracks) seems too much. Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html