I’ll go first:

  • Xerox Star
  • IBM TopView
  • DRI CP/M 86 & Concurrent DOS

34 Comments

  1. Does DOSBox count?

    Only used it for Monkey Island and Duke Nukem 3D.

  2. As far as personal use goes, DOS 3.3. Back when floppy disks were floppy, and software came in the mail.

  3. StickyBlueJuice

    OS 2 when I was helping my mother update the bank computers. 😀

  4. I don’t even know what it was called. All I know is that it was a Tandy computer and it was 1987. Green screen and two 5-1/4” disk drives. No mouse. I was 5.

  5. Mobile-Ad-494

    i was using Atari OS rev.2 before i got my first real PC with MS-Dos 3.3

  6. SimpliEcks

    DOS. It was some proprietary version of DOS for a Ericsson Step/One PC.

  7. Whatever the hell ran on a TI-99/4A. I honestly don’t remember.

  8. Windows NT

    Some really old Mac (LC520) not sure what mac os was on it

  9. Significant_Back3470

    MS-DOS 3.2. the whole os is fit in a single 5.25′ floppy disk(720KB)

  10. IsAnyoneEnjoyingThis

    Acorn Electron text based OS… called Basic.

  11. DarkestBadger

    if we are talking GUI then it would be FinalCartridge Desktop for the C64.

  12. Cajiabox

    Windows 95, the first pc my dad build for me, had a blast playing emulators

  13. bedwars_player

    it was either windows 7, or android 4.03 on an lg optimus L5…

    cant remember if my families old laptop was windows 7 or 8.1

  14. Meadowlion14

    SGI’s custom UNIX OS IRIX.

    I was told a scientific program needed to be built on it due to some dependency. I used it for a while to get used to the OS until I finally found the dependency elsewhere and compiled it for modern Linux and then never used it again.

  15. Spongman

    oldest: Michigan Terminal System (MTS) on an Amdahl 470/V8. next: rsts/e on a pdp-11 (i had 1,4 !)

  16. sarsilog

    Windows 3.1 during elementary computer classes.

  17. _Middlefinger_

    DOS, at the time not in a recent ‘retro’ way. Also BBC Basic.

    Been decades since I used it but I think I could still get by with it.

  18. DaSpAsSw

    Windows 95 was the first one I used as a young kid

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