So I decided to make a list of all the operating systems I’ve ever used. now by used I mean really used for meaningfull stuff not just logged in on once. I think I have written a program on everyone of these. Most of them for actual money. On everyone of them I have had administrative privs equivilent to root on Unix. On the ones marked with an * I had knonwledge of the internals of the operating system at a level that let me make modifications to it or use internal tables/data in ways that regular programers could not. For RSTS/E I was actually part of the OS development group and wrote extensive code that was shipped with the OS to customers.
• IBM 1130 DOS
• RSTS/E *
• RT-11/CTS-300 *
• RSX-11M (and other closely related)
• OS 16 (Perkin Elmer/Interdata)
• OS 32 (Perkin Elmer/Interdata) *
• Unix/Linux (several versions)
• VMS (Vax/VMS and Alpha VMS) *
• MS-DOS/Windows (lots of versions)
• Mac OS
Two of them I actually like less than Unix/Linux. A couple of others are less powerful than Unix/Linux but so easy to setup and use that I like them better anyway. I don’t actually think of myself as being all that experienced BTW. There are a number of operating systems I wish I’d gotten to try. I think it is really too bad that there are so few operating systems in general use today. I blame Linux for that. Given the high cost of entry for developing a new OS competing with free means very little chance to recoop costs. And Linux sucks up all the people willing to work for free.
BTW A few computers I’ve worked with hardly count as having a real OS. Such as the following:
PDP-8 with paper tape assembler
First generation TRS-80
Anyone here have a longer list?