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Type: Posts; User: dfnr2

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  1. Replies
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    Thanks! Woodworking shops will often stock...

    Thanks!

    Woodworking shops will often stock unfinished, raw boards of various types, including walnut. Getting fully prepared boards will be more difficult, but I think those same shops might be...
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    I've been looking into masonite, which is a brand...

    I've been looking into masonite, which is a brand name for a type of hardboard. It is harder and stronger than MDF, but still will tends to swell and deteriorates with age. A decent plywood is...
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    This is with 11 coats of General Finishes water...

    This is with 11 coats of General Finishes water soluble high performance topcoat (satin), with sanding between coats as needed. No stain.

    55863
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    Thanks. I opted to use 1/4" plywood because I...

    Thanks. I opted to use 1/4" plywood because I found a piece big enough to use, but there's no reason why it could not have been masonite. I can't see any real advantage for one over the other.
    ...
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    Sol-20: Side replacements

    I while back the shelf holding my Sol-20 failed, and the Sol fell 8 feet onto the floor, bouncing off the bench. The machine survived, but the sides were dented and scratched beyond reasonable...
  6. Thread: OSI 300 Video

    by dfnr2
    Replies
    4
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    158

    I think I have some dealer newsletters which...

    I think I have some dealer newsletters which chronicle the trajectory. I'll see if I can get them scanned.

    Also, take a look at the peek(65) issues on OSIweb.org. The editor(s) often included...
  7. Thread: OSI 300 Video

    by dfnr2
    Replies
    4
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    158

    Mark has a photo on his OSI board catalog page: ...

    Mark has a photo on his OSI board catalog page:

    http://osi.marks-lab.com/boards/boards.html
  8. Thanks! The forum software seems to have...

    Thanks! The forum software seems to have dramatically downsampled the image. The module allows selection of up to 16 1K/2K ROM images. Just in case someone has a system with 1K at C000 and...
  9. Just sent off the Gerbers. I'll post the results....

    Just sent off the Gerbers. I'll post the results.

    55403
  10. I've seen that. It uses a pair of 27c16 EPROMs...

    I've seen that. It uses a pair of 27c16 EPROMs and a toggle switch to select between two personalities. However, it cannot remap the ROM without a main board mod.

    Since I couldn't find any open...
  11. DFW Retrocomputing Meetup Saturday Oct 12, 2019

    The fall DFW Retrocomputing Meetup (Renamed from North Dallas Area Retrocomputing) is scheduled for Saturday October 12, 2019 at the Dallas Makerspace.

    We have booked two rooms (Interactive...
  12. Whoops, never mind. A1 and A2 have +12V and -12V...

    Whoops, never mind. A1 and A2 have +12V and -12V on them. Looks like all the pins are actually used, although the PGM0-3 lines on B1-B4 seem to be for in-situ factory programming of the boards, and...
  13. SOL-20: Remapping Personality Module and video from Cxxx to Fxxx

    Hi All,

    I was just looking at the Cxxx -> Fxxx remapping hack for the Micro-Complex Dual Personality Module.

    I don't have a schematic for the module, but from the description in their manual...
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    My estimate was a bit off. It's 22 x 19 x 11. ...

    My estimate was a bit off. It's 22 x 19 x 11.

    Using the online calculators, here are some sample shipping rates for UPS ground tested on addresses in my UPS address book. (FedEx and USPS rates...
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    Heathkit H8 box with molded styrofoam

    I picked up a huge Heathkit haul last weekend. After sorting out the stuff, I have a left over empty H8 box (labeled with Heathkit-Zenith logos) with the molded Styrofoam. That's one box and two...
  16. IMSAI 8080 Paddle replacement results thread

    My IMSAI 8080 recently sustained some damage (another thread) and luckily survived with only some broken switch paddles. Unfortunately, the paddles are no longer available in the orignal color,...
  17. 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...
  18. Thread: Sol 20 spacebar

    by dfnr2
    Replies
    0
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    295

    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...
  19. 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...
  20. 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. . .
    ...
  21. Replies
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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...
  22. 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...
  23. Replies
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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
  24. Replies
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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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