5 Sep
2002
5 Sep
'02
1:48 a.m.
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.