From: johnh@psych.usyd.edu.au (John Holden)
Subject: [pups] Unix and PDP11/20 (was PDP9?)
Date: Thu, 5 Sep 2002 09:48:22 +1000 (EST) [thread overview]
Message-ID: <200209042348.JAA24393@psychwarp.psych.usyd.edu.au> (raw)
On Wed, 4 Sep 2002, Dennis Ritchie wrote:-
> I'm not positive about the logo on our first PDP-11.
The picture of Dennis and Ken in front ASR-33's hints at a pdp11/20 logo
on the console. The 11/20 I have (built 29/1/71, SN 821) has just plain 'pdp11'.
The lead time on getting the machine was about 6 months. I suspect that the
/20 was added as other models were in the pipeline (/05,/45).
For a picture, see http://www.psych.usyd.edu.au/pdp-11/11_20.html
> Incidentally, the machine's handbook was a wonder.
Indead it was
The front cover is interesting, in that it shows a table top version of the
11/20. It was quite possible to run one just with paper tape and an ASR33 with
the reader/punch option. There was a similar option for the pdp8/e.
The only obvious change between the first and second edition handbooks was that
the latter changed the last page from a picture of a young lady in front of
a machine to a table of Unibus pin assignments.
next reply other threads:[~2002-09-04 23:48 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-04 23:48 John Holden [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-09-08 21:48 John Holden
2002-09-07 0:36 Carl Lowenstein
2002-09-06 6:08 Dennis Ritchie
2002-09-04 22:44 Carl Lowenstein
2002-09-04 4:21 Dennis Ritchie
2002-09-04 21:58 ` Johnny Billquist
2002-09-12 21:27 ` Jeffrey Sharp
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