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- From: jones@pyrite.cs.uiowa.edu (Douglas W. Jones,201H MLH,3193350740,3193382879)
- Newsgroups: alt.sys.pdp8
- Subject: Re: PDP-8 Collectors
- Message-ID: <1992Nov5.195426.10466@news.uiowa.edu>
- Date: 5 Nov 92 19:54:26 GMT
- References: <Bx946L.KCM@uxa.ecn.bgu.edu>
- Sender: news@news.uiowa.edu (News)
- Organization: University of Iowa, Iowa City, IA, USA
- Lines: 79
- Nntp-Posting-Host: pyrite.cs.uiowa.edu
-
- From article <Bx946L.KCM@uxa.ecn.bgu.edu>,
- by mgcbo@uxa.ecn.bgu.edu (Charles B. Owen):
- > I think lots of the machines are still floating around (???)
- Yes they are. Over the summer, I picked up three Omnibus machines
- (model E, F and A) at U of Iowa surplus, and I know where there are
- a number of model I and L machines on campus, yet to be sent to
- surplus. I suspect that most big research universities are similar,
- with various machines mothballed or in storage closets in various
- places on campus. Look in the back storerooms of chemistry,
- engineering, or psychology labs for such things.
- >
- > Is anyone else doing this, as just a hobby (not maintaining one for
- > business use)?
- I have a model E and a model F in my study at home, neither works
- yet, but I ought to be able to get one up fairly soon (given the
- time to track down some bugs in the front panel). If I had a spare
- RX8E board, I'd be able to build two complete useful systems, since
- I have two RX01 dual diskette drives.
-
- At work, I've talked our department into providing a home for a
- 1966 vintage PDP-8, and I have a small group of students starting
- the job of figuring out whether it is safe to plug it in and try
- turning it on (such wonderful questions as: are all the flip-chip
- modules plugged into the right slots, and what cables go where?)
-
- There are also very likely to be many industrial users of PDP-8
- based systems. Just last month, I was talking to a man from an
- Alcoa plant, and he said that they were still using NC machines
- that were real antiques. I'd lay even odds on an antique NC
- machine being PDP-8 based!
- >
- > How available is software that I would not have to pay DEC for? Much PD
- > available?
- There's a young but growing PD repository of PDP-8 software at
- ftp.telebit.com. I'm not clear on whether I have the right to
- distribute the ancient DEC source code I have, but I'll be finding
- out.
-
- > For obsolete hardware, it would almost make sense for DEC to
- > give the stuff away.
- Yes. So far, DEC has been quite nice about granting permission
- to reprint their documentation, and I imagine they'll let us do
- the same to their ancient software, but I have not confirmed
- this. Remember that DEC only discontinued the PDP-8 product line
- in 1990 with the demise of the DECmate III+, so some PDP-8
- software may still be considered to have current market value,
- and DEC probably still has a number of customers with service
- contracts and other money making relationships who are running
- DECmates and end-of-the-run Omnibus machines.
- >
- > Any problem maintaining these systems? I am very good at electronics,
- > so I can handle anything I can get parts for. But, are there many
- > custom parts that are difficult to obtain? (particularly mechanical
- > parts) DEC still support? (Reasonably)
- Everything can still be found commercially, much of it on the
- reconditioned second-hand market. Individual boards for the
- OMNIBUS models of the PDP-8 sell for about $75, on the price lists
- I've seen.
-
- If you get a classic or straight -8, parts are no problem, since
- everything is discrete component, and plain transistors and diodes
- will never go out of style. If you get an OMNIBUS machine, there
- are custom SSI and MSI chips used that are out of production. If
- you ever need to replace such a chip, you'll have to hunt down
- one of a small stock of spares or cannibalize a chip from a
- different board. I have collected every OMNIBUS board I could get
- my hands on for this purpose, including a number of real junkers
- that were hand kluged I/O interfaces for one-of-a-kind devices.
- >
- > Any idea what used systems are costing? I an talking about the real
- > PDP-8's, not the Rainbows.
- I bought a PDP-8/E, and 8/F and an 8/A plus two RX01 units for a
- total of $25. I spent $35 for one relay rack, and got the other
- free. Of course, when you buy surplus, you never know whether or
- not it will work, and the good prices only happen when there's
- nobody else bidding on the stuff.
-
- Doug Jones
- jones@cs.uiowa.edu
-