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- Newsgroups: alt.sys.pdp8
- Path: sparky!uunet!destroyer!sol.ctr.columbia.edu!eff!vallista.eff.org!user
- From: efh@eff.org (Ed Hardebeck)
- Subject: Re: New owner of a PDP-8e
- Message-ID: <efh-131192134707@vallista.eff.org>
- Followup-To: alt.sys.pdp8
- Sender: usenet@eff.org (NNTP News Poster)
- Nntp-Posting-Host: vallista.eff.org
- Organization: ON Technology
- References: <1992Oct27.102532.60147@cc.usu.edu> <1992Oct27.194507.21093@news.uiowa.edu> <1992Oct28.235258.4581@s1.gov>
- Date: Fri, 13 Nov 1992 18:50:12 GMT
- Lines: 45
-
- In article <1992Oct28.235258.4581@s1.gov>, jtk@s1.gov (Jordin Kare) wrote:
- > Migawd! 30 years of PDP-5's! You might check with the MIT Electronics
- > Research Society, room 20B119 (?) at MIT. They used to have a PDP-5
- > (I know because I rebuilt it, long ago in my college days) and may
- > well either still have it or know where it went. Geoff Rochat would
- > be the person to ask.
- >
- > Jordin Kare
- > --
- >
- > Jordin Kare jtk@s1.gov 510-426-0363
-
- Hi Jordin!
-
- You might recall that you (representing ERS) sold that PDP-5 to me in 1979
- for $25.
-
- I had it running for quite a while, I remember that due to corrosion on the
- System Module contacts sometimes an accumulator bit would get "stuck". You
- could usually tell which bit by the lights on the front panel, then go into
- the back,
- count over to the right module (there were 12 for the accumulator, one for
- each bit)
- and wiggle it a little, then hit Continue and go on. (Of course the
- program would still
- be fine in core, that would stay even between power cycles).
-
- We had it connected to the original MIT PDP-1 3340(?) display
- (*the*original Spacewar display) which I had also acquired. We hacked up a
- version of Munching Squares for
- the 5 and the 3340 scope.
-
- I believe that after I moved my roomates donated the 5 to the Computer
- Museum
- sometime in the mid '80s. There was a complete set of documentation (which
- in those
- days included full schematics and a tutorial on the diode-capacitor logic
- (0 and -3
- volt logic levels) used in the System Modules).
-
- The Computer Museum had a 5 previous to this, so they should have at least
- two now.
-
- Ed Hardebeck
- efh@eff.org
-