Forum Rules and Etiquette

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Ibm 5110 dos

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    Originally posted by bear View Post
    They're DC300 carts all right. But the data format is not any QIC standard. For a start it's two (parallel) track. Not serpentine.

    I would also be surprised to learn the external drive has a different data rate. Unless it also has a different tape speed, and the end result is a recorded cartridge that can be read on either drive.
    Not that unusual--I've got a 3M DCD-2 2 track drive that takes DC300. Used on some sort of industrial gear. If it's a Quarter Inch Cartridge, I think it's safe to call the physical media QIC. When you get into some of the preformatted cartridges (e.g. Iotamat), things get even stranger.
    Reach me: vcfblackhole _at_ protonmail dot com.


      "If it's a Quarter Inch Cartridge, I think it's safe to call the physical media QIC."


      QIC is a industry standards organization. 3M made DATA CARTRIDGES (where the DC comes from) for almost ten years before the Quarter Inch Committee existed.
      I checked the literature before QIC standards were invented and companies called them DATA CARTRIDGES

      It is VERY confusing to use QIC for Quarter Inch Cartridges.

      and that is all I'm going to say on this subject.


        On the topic of these cartridges, I'd love if there were a way to back up a few IBM 5100 Basic Problem Solver Library cartridges that I have, which are crumbling. I'd also love it if anyone had data from any of the other 51x0 tapes distributed by IBM, including any APL Problem Solver Library software and the second-level debugger that doesn't live in ROS.


          Any chance it's as easy as loading up the files and saving to a newer tape? I don't have any tapes but I do have a 5100 with 5106 external tape drive. I haven't had the opportunity to mess with tapes yet but if I could help make duplicates, I would be happy to help.
          Maintainer of


            I think the tapes are not in good enough shape for a 5100 to be able to read them productively. I think what you'd want is something a bit more like a KryoFlux that can record an analogue signal and then try and reconstruct the binary data from what you're able to pull from the tape. There are several folks on this forum who have worked on recoveries not unlike this, but it's an undertaking to be sure.