Roger Merchberger wrote:
  Once upon a midnight dreary, Derek Peschel had spoken
clearly: 
  >> >POS (PERQ Operating System or Pascal OS)
was the first PERQ OS. It's 
  >> POS has got to be the single most overused OS
name!  DEC used it for the 
  >Oh, come on.  There's got to be TONS more OSs
with "DOS" in their names. 
  Plus, for the Z-80 side of RS, you had TRSDOS, LS-DOS,
NewDOS, and prolly
 more I've never heard of, but *none* of these examples are what Zane was
 originally referring to, for DOS is only a subset of the entire, correct
 name. In fact, MS-DOS and PC-DOS wouldn't even count for his argument. 
Yes, you're right.  Zane has a perfectly good point.  I was just struck by
the irony that he may be talking about 4-5 OSs while I can come up with
dozens.  Actually, I do kow of a few "just plain DOS" systems:  DOS for the
IBM System/360, DOS for the Apple ][, DOS for the Atari 8-bit machines, DOS
for the PDP-11.  You might be able to come up with more DOS's than POS's if
you tried hard enough.
-- Derek