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From: pdb@sei.cmu.edu (Patrick Barron)
Newsgroups: comp.arch,comp.unix.wizards,comp.os.minix
Subject: Re: pdp-11/55
Message-ID: <2818@aw.sei.cmu.edu>
Date: Fri, 9-Oct-87 17:37:53 EDT
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Posted: Fri Oct  9 17:37:53 1987
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In article <89@piring.cwi.nl> jack@cwi.nl (Jack Jansen) writes:
>	11/23	LSI version of 11/34 with Q-bus.
>	11/24	Ditto, only this one had a unibus, a 22 bit memory
>		bus and a unibus map.

The F-11 based machines (the 11/23 and 11/24) were also much slower than
the 11/34.

>	11/74	LSI version of 11/70, with qbus.
>	11/84	Souped up version of 11/74.

The 11/74 was a prototype multiprocessor 11/70.  I think only one was ever
made.  The 11/73 is the Q-bus 11/70 (based on the J-11 chipset).  The 11/83
is a faster 11/73 with a special memory bus (the PMI bus).  The 11/84 is a
Q-bus 11/83.

--Pat.