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From: fouts@orville.nas.nasa.gov (Marty Fouts)
Newsgroups: comp.arch,comp.unix.wizards,comp.os.minix
Subject: Re: pdp-11/55
Message-ID: <3019@ames.arpa>
Date: Wed, 7-Oct-87 13:36:17 EDT
Article-I.D.: ames.3019
Posted: Wed Oct  7 13:36:17 1987
Date-Received: Sat, 10-Oct-87 09:59:36 EDT
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Reply-To: fouts@orville.nas.nasa.gov.UUCP (Marty Fouts)
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It has been a few year (;-) since I played with PDP 11/XX machines,
but let me try to dredge some data from memory.  The 11/60 was suppose
to be the be all / end all of the PDP (as opposed to LSI) 11/XX
machines.  (The distinction was that PDP engines were all TTL and LSI
were lsi)  It was late.  (Anybody surprised?)  So DEC whipped together
a hacked up version called the 11/70; which was the last core memory
"tall boy" cabinet PDP 11.  The 11/60 ended up in a "low boy"
cabinet (half height - double width) and had MOS memory in most (all?)
cases as well as a Writable Control Store.  The 70 had massbus
adapters, a unibus and two data paths from the processor to memory, so
became the more popular machine.

We managed to support 30-50 people on a 70 running RSTS/E, mostly
doing school adminstration (payroll, grades, etc) and learning Basic,
Fortran and PASCAL; something we were never able to get an 11/780 to
do.  That 70 had 256kb of mos memory and 4 RL02 (5 MB each) disk
drives. . .  Down the road, a different school at a 60 and was able to
support about the same number of people, so I guess the two machines
were roughly equivalent.

Marty