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Type: Posts; User: dfnr2

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  1. I have a PDP-8/e that was used to control...

    I have a PDP-8/e that was used to control stitching machines for embroidery patterns on cowboy boots. The gentleman who sold it to me said that he had been in the business since 1972, and only then...
  2. Thread: Sol 20 spacebar

    by dfnr2
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    0
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    226

    Sol 20 spacebar

    Does anybody know of a suitable replacement for the spacebar on the Sol 20? The key switch mechanism itself appears fine. But the spacebar, spring, and stabilizer are gone. I'm grateful for any...
  3. I think Memphis State University (Now University...

    I think Memphis State University (Now University of Memphis) had a deal with Hazeltine back in the 70's. All the campus terminals (used with the Sigma 9 timeshare system) were Hazeltines. Most were...
  4. WTB: Hazeltine 2000 terminal, working if possible.

    I am looking for a Hazeltine 2000 terminal in good condition, with keyboard. If there's something you're looking for that I have, I would also consider a trade. PM me if you have any leads. . .
    ...
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    Last week I took apart the cassette recorder. ...

    Last week I took apart the cassette recorder. Both belts were loose, and the gears were gummed up, so nothing would move. The inside was pretty dirty. I was not sure if it was safe to clean this...
  6. What are some good period correct cassette recorders for 1976-1980 machines?

    This is not a want ad, it's a request for information about cassette players that were available in the 1976-1980 time frame.

    What were some nice quality, reliable cassette players or decks that...
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    The Class X RIFA safety cap in the Astec power...

    The Class X RIFA safety cap in the Astec power supply fails short and will prevent startup. However, the supply will function normally when the cap is removed entirely.

    Dave
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    Thanks for the correction. I apologize--I am not...

    Thanks for the correction. I apologize--I am not very familiar with the PET machines. That would make sense though, since Signetics did make 2316 ROMs. I didn't realize there was a board with 2316...
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    These are the upgrade ROMs in the machine. Since...

    These are the upgrade ROMs in the machine. Since the original ROM set had 8 ROMS, and only 4 are installed now, what is the difference? Should more ROMs be installed (perhaps some of the original...
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    Here are the "before" photos. These show the...

    Here are the "before" photos.

    These show the machine booting up. The pyramid-shaped case is a fitting tomb for several mummified lizards. The closeups show the rusty case. The pictures do not...
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    Here's the original ROM set: 52063 They are...

    Here's the original ROM set:

    52063

    They are 6540's. The whole set seems to be designated 901447-xx, which looks like a Commodore internal part number. I suppose Signetics was a second source....
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    I've already repaired the power supply from the...

    I've already repaired the power supply from the Apple II, just before a shelf broke and a bunch of heavy computers fell on the Apple II. The Apple seems to be relatively unharmed other then a few...
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    I do have some photos, and will try to post them...

    I do have some photos, and will try to post them this weekend. I got this and a (nonworking) Apple II+ from a local gentleman who wanted to find a good home for them. He bought the PET when it...
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    Perhaps that's what happened. If that's the...

    Perhaps that's what happened. If that's the case, I will not feel too bad about trying to bend the mounts (on the case) a little to line up all the holes. I doubt the mounts themselves got bent,...
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    PET 2001-4 restoration

    I recently picked up a PET 2001-4 in pretty rough shape. I am in the process of restoring it. I have some pics of the restoration in progress and will post them once I can resize them.

    Since the...
  16. WANTED: Apple II Power supply box (ASTEC AA11040B)

    Hi all, I recently experienced a bit of a disaster. An 8.5 foot high shelf gave out and several heavy computers fell to the ground. I had an Apple II+ Astec power supply out on the bench for...
  17. This was a 6-foot section of the shelves going...

    This was a 6-foot section of the shelves going all the way around the lab, which is about 12x22 ft. Unfortunately, some of the stuff I love the most is also the heaviest. Needless to say, I'm...
  18. I can only blame myself. I am one of those guys...

    I can only blame myself. I am one of those guys who could never build a square box. I had asked the carpenter to build the shelves to hold the weight, but he used 1/2" MDF, and retrospect, his...
  19. Vintage computer 11-foot drop test results. . .

    I'm a bit bummed out at the moment.

    When I moved into my house, I had a carpenter put some shelves about 10 feet above the ground around the walls of my lab (a converted 1-car garage). They...
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    The next meetup is Saturday April 27, 2019,...

    The next meetup is Saturday April 27, 2019, 3PM-6PM at the Dallas Makerspace, as usual.

    As always, we will have tables and electrical hookups, plus wireless. Bring something old or something...
  21. I actually have the manual, and from the...

    I actually have the manual, and from the description, I infer that the only difference between the keyboards is the extra legends on the keys.

    Since the APL character set is a straight-up...
  22. Anyone have an APL ROM for the DecWriter II (LA36)?

    I have a working LA36, but not the APL version. I'm wondering if anyone has a terminal with the APL upgrade. Is it just a ROM set, or a whole plug in board? Obviously I'd have to do something...
  23. Thread: C2-4p

    by dfnr2
    Replies
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    1,587

    I noted that your earlier post described an ?SN...

    I noted that your earlier post described an ?SN error. There was a bug in the OSI version of Microsoft BASIC that resulted in a graphics character being printed instead of the second character of an...
  24. Thread: C2-4p

    by dfnr2
    Replies
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    1,587

    ROM#3 is the where the garbage collector bug...

    ROM#3 is the where the garbage collector bug lives. It is (and was) common to replace it with a 2716 containing a patch for the bug.
  25. Thread: C2-4p

    by dfnr2
    Replies
    19
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    1,587

    Nice!! An old-school very early C2-4P with a 500...

    Nice!! An old-school very early C2-4P with a 500 board. There are not many of those floating around.
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