ImageDisk 1.08 posted

Dave Dunfield wrote: OK, so I decided to have some fun pointing it at an HP150 stiffy. I'm thinking that this is a single-sided HP150 stiffy. Exactly what that means in terms of the on-disk format, I don't really know, just that it should be readable in a 9121 or 9133XV with a single-sided stiffy drive. The HP150 would have been talking to one of several HP-IB-attached drives, where the drive would have its own microcontroller and disk controller, and I'm thinking the firmware in the drive may have some notions of using some sectors on the disk for its own data and so the HP150 doesn't do any more than tell the drive to format the disk, and the HP150 might not get to use or see all of the disk. How does ImageDisk develop its list of sector numbers? I ask because it seems to think this stiffy has 70 tracks, with 17 sectors per track, with the sectors numbered 0, 11, 6, 1, 12, 7, 2, 13, 8, 3, 14, 9, 4, 15, 10, 5, 17 on the even tracks and 8, 3, 14, 9, 4, 15, 10, 5, 0, 11, 6, 1, 12, 7, 2, 13, 17 on the odd tracks. (These derived from IMDU output after a run.) Some stuff re-keyed from the screen on another run (is there a way to get it to log this stuff to a file?): Read into C:\FRANK\WORK\V2B.IMD Interex CSL/150 volume 2 from master 0/0: Unable to determine interleave : 250k DD - 17 sectors of 256 bytes - G1:24 G2:37 : Read error <17> NoSector - Reanalyzing : Unable to determine interleave : Read error <17> NoSector - Unavailable 0/1: Single-sided 4/0: Unable to determine interleave 0/0: Single-step 1/0: Unable to determine interleave : Read error <17> NoSector - Reanalyzing : Unable to determine interleave : Read error <17> NoSector - Unavailable It continues much like this through subsequent tracks (gronk, gronk), which takes a while, but this may be what I get for asking it to do a full analysis. Yes, I should probably sit down and read the manual a bit before charging in like this. BTW, if someone out there has the HP150 Technical Reference manual set, and it says something about what the expected on-disk format is, I'd like to know more about that. Similarly for anyone who has some idea what the 9121/9122 drives think about where they're allowed to scribble on the disk. -Frank McConnell