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Recent content by Al Kossow

  1. Al Kossow

    California PDP10/KL10 system, not turned on, no disc drives

    The cluster controller for the KL (CI-20) talks to an HSC-50 with special software to support 576 byte blocks There were no cluster disks on the system, just RP05s Memory is vague, but they may have moved them onto the VAX that replaced it.
  2. Al Kossow

    Looking for CPF for the IBM System/38

    Don't hold your breath getting anything from Mike (Smaug) Ross
  3. Al Kossow

    California PDP10/KL10 system, not turned on, no disc drives

    I was involved in the de-installation from the Long Beach school district. It is a complete 2065 system that was still working when deinstalled. There should also be a couple of disk drives. I still have some of the disk packs that have been kept in a controlled temperature environmen. The...
  4. Al Kossow

    Floppy Drives with Dual Index and WP Sensors

    I have a Wangco floppy brochure scanned on bitsavers. The 5.25" drive is the Model 82. Found a picture of one on line. It looks like a couple of companies used them.
  5. Al Kossow

    IBM Displaywriter 6580 journey

    very little is known about the printer, since so few people saved them there is quite a bit of intelligence inside of them
  6. Al Kossow

    We need something better than cards for retro PC HD Drive Replacement

    CDs rot from the edges inward. https://en.wikipedia.org/wiki/Disc_rot
  7. Al Kossow

    MARCH Burroughs B80 system

    I've been in contact with Dave about it, and some of the documention on bitsavers is from them. Imaging the floppies is challenging, because most models of Burroughs floppies are very un-IBM standard.
  8. Al Kossow

    Microdata 3200 Info?

    talk to Jim Stephens. He hangs out on the cctlk discord
  9. Al Kossow

    8 bit IDE (XTA) Replacement Project

    @tubetimeus has a prototype replacement running. https://mastodon.social/@tubetime/110783604330499249
  10. Al Kossow

    Qume Terminal membrane keyboard repair

    did you look at http://bitsavers.org/pdf/qume/terminal/QVT-102/QVT-102_kbd the firmware is in http://bitsavers.org/pdf/qume/terminal/QVT-102/firmware/K301_14F2_8748.BIN and there are 8048 disassemblers out there 1K of code and the schematic shouldn't be rocket surgery to figure out the terminal...
  11. Al Kossow

    Twinax balun, etc. questions

    nothing -- pigtail -- twinax cable -- pigtail -- twinax cable -- pigtail -- balun -- RJ-45 cable -- balun -- converter so you need to terminate the right-hand end with a terminator. the 'nothing' at the left end is actually a terminator
  12. Al Kossow

    Twinax balun, etc. questions

    this is what a twinax twisted pair active hub looks like inside
  13. Al Kossow

    Twinax balun, etc. questions

    IBM never really documented the 5250 twinax protocol the way they did for 3270. National wrote some informative app notes you can find under http://bitsavers.org/components/national/_appNotes/ for their DP8244 biphase communications processor, in particular AP-516 and AP-517 so for point-point...
  14. Al Kossow

    RK05 disk emulator development and discussion

    have you decided on a kit price?
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