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From: Lars Brinkhoff <lars@nocrew.org>
To: Dan Cross <crossd@gmail.com>
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	(Dan Cross's message of "Fri, 10 Feb 2023 10:33:22 -0500")
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Dan Cross wrote:
> Warner Losh wrote:
>>> Jonathan Gray wrote:
>>> >> Any chance this DOS supdup software is still around?
>>> > http://www.bitsavers.org/bits/MIT/pc-ip/
>> I wonder if this was the same supdup that the early BSDs used to
>> distribute their source in the 90s ..

If there was any RFC734 supdup in BSD, then I'm guessing that would have
been a different one written by David Bridgham.  The PC/IP one seems to
be targeted specifically at MS-DOS, although cross compiled from BSD.
Maybe Bridgham was involved in that one too, though.  I have asked, and
will report back.

> I believe they are entirely different.  If I recall correctly (and
> it's been a while...) csup, CVSup, et al were based on `sup`

If Warner was referring to those, then you would be right.