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- From: davidb@zeus.ce.washington.edu (David W. Barts)
- Newsgroups: comp.sys.apollo
- Subject: Re: Old Apollo system wanted....
- Summary: heats your house, too!
- Message-ID: <1992Aug18.172226.908@u.washington.edu>
- Date: 18 Aug 92 17:22:26 GMT
- References: <1992Aug13.160654.21360@usenet.ins.cwru.edu> <5a8a88e9.1bc5b@pisa.citi.umich.edu>
- Sender: news@u.washington.edu (USENET News System)
- Organization: University of Washington
- Lines: 43
-
- In article <5a8a88e9.1bc5b@pisa.citi.umich.edu>, rees@pisa.citi.umich.edu (Jim Rees) writes:
- > [ edited ]
- > In article <1992Aug13.160654.21360@usenet.ins.cwru.edu>, aj681@cleveland.Freenet.Edu (Carlin Wiegner) writes:
- > I need an old multiuser system, I was looking at PDP-11s but
- > they need 3 phase power which isn't the easiest thing to get.
- >
- > That depends on the 11. As I recall, even the 11/70 (the biggest model I
- > ever used) could be wired for single phase. Some of the peripherals,
- > particularly disk drives (rk07?) required three phase, but you could
- > certainly put together a working system that runs on household power (single
- > phase, 110/220, 30 amps or so).
- ^^^^^^^
- >
- > Another fun early Unix system was the Interdata (later Perkin-Elmer) 7/32
- > and 8/32. This was the first non-11 system to get a port of v7, and the
- > only non-11 to run v6. This one ran on single phase but took lots of it,
- > maybe 40 amps of 220. There were in fact two ports of v7 for it, one by
- ^^^^^^^
- > Dennis Ritchie using the Johnson portable C compiler, with the stack growing
- > forwards, and the other by Miller at Wollongong using the Ritchie compiler,
- > with the stack growing backwards. The Miller v6 port was my first Unix,
- > back in 1979.
-
- With power consumption like that, you can also sell your old furnace
- since you won't be needing it any more.
-
- This is the major reason why things like used VAX-11/780 systems are so
- cheap these days. I once did a back-of-the-envelope estimate of
- electricity costs to keep an old VAX up and running continuously, and
- it was in the low five figures per year. (Correct me if I'm wrong, bit
- isn't it the case that most of these systems were _designed_ to run
- continuously, and powering them up and down frequently shortens their
- lifespan?) For that price, one can buy a very nice Sun or HP
- workatation that will run circles around an old VAX while consuming far
- less power. This is in Seattle, home of some of the lowest
- electricity rates in the USA.
-
- Of course, if the system is just for a collector's item and you don't
- mind leaving it powered off most of the time, this doesn't apply.
-
- --
- David Barts N5JRN UW Civil Engineering, FX-10
- davidb@ce.washington.edu Seattle, WA 98195
-