[TUHS] MS-DOS

[John Cowan]

Clem Cole scripsit:

> ​UNIX could (and did) at the time --   by the time of the AT (which was
> when the PC's hockey stick curve took off) an 5.25" floppy had a capacity
> of 1.44M.  An RK05, the V6 and V7 standard,  was 2.5 M which is a 40% loss
> of space, but it was do-able.  

The AT also had the 10 MB disk.  Back when I had an AT, I ran Xenix
System III on it along with the MS C compiler, and was able to create
console-mode programs to run on everyone else's MS-DOS machines.
It's hard to remember/believe that Xenix was a Microsoft product before
DOS was.

> > DEC had several (RT11, RSTS, RSX) and the line is perhaps a little fuzzy:
> > they were getting operating-ish.
> >
> ​Be careful here Ches.  RT-11 and DOS-11 meet your (and my definitions).

I would say even RT-11 is somewhere between executive and OS.  It could
run foreground tasks (hence the name Real Time) if properly sysgenned,
and it had a decent kernel API that you didn't have to bypass.

> But RSTS and RSX were multi-users and ran (run) protected mode, have/had
> full networking stacks etc.  

+1

-- 
John Cowan          http://www.ccil.org/~cowan        cowan at ccil.org
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