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Thread: Digital Group Video Card Availability?

  1. Default Digital Group Video Card Availability?

    Couple of questions related to this video card that was initially designed for the Mark-8, but also used with other systems, such as the SCELBI. I'm interested in having one to go with my growing array of SCELBI peripheral devices.

    1) Does anyone have or know of one that may be for sale?

    2) I'm pretty much assuming that the answer to 1 will be no, so am considering building a reproduction. The information needed is already available, so that isn't an issue. Is anyone else on this list interested in building a reproduction? If I can't find an original, once I get the CAD work done, I'd be building a small batch, but the size of the batch partly depends upon interest in the hobby community. More people interested equals lower per unit cost.

    regards,
    Mike Willegal

  2. #2
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    I can't help directly with any of what you're asking, but I saw earlier today there's a Digital Group system up for sale.

    https://www.ebay.com/itm/Vintage-197...53.m1438.l2649

    Are any of the cards shown with it the video card you are interested in?

    Just a long shot...

    smp

  3. Default

    that is a later system, which I understand, has an evolved version of the video card in it

    -Mike

  4. #4
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    Pretty much the only person I know of that has one is Bryan (Byte Collector). I'm a big dg fan and I've never seen one in the wild. I expect I won't.. they look too much like random circuit board junk to be something people will save.

    I'm actually working on a replica myself for my Mark-8 project... basically borrowing from scans and such from Bryan's site. I want mine on vintage PCB stock so it looks correct, but I'd probably be interested in a 'produced' version too.

  5. Default

    A short update on my Digital Group video card project.

    I have acquired all the really hard to source parts, which wasn't too difficult or costly. I have also started on the PCB layout. Seems like no real blockers in sight. It will be interesting to see if there is much difference between the schematics and the board pictured at: https://bytecollector.com/m8_docs.htm

    The PCB layout might take a while, as I have a lot of different projects competing for my limited free time.

    regards,
    Mike Willegal

  6. #6
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    Hi Mike, a few years back I designed a video card that is compatable with my Mark 8. It is all mostly ttl. I use one of the ic sync generators available at the time. The only "cheat" was a modern negitive voltage generator for the -12 sync generator. I designed and built a pcb for mine. If you are interested I can send you the info.
    Spread the joy of Vintage Addiction

    -->www.chronworks.com/<--->www.i8008.net/<--

  7. #7
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    Spread the joy of Vintage Addiction

    -->www.chronworks.com/<--->www.i8008.net/<--

  8. #8
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    Oh, and BTW if you design a video card for the Scelbi I am interested in a board.

    Are you going to do a run of any more keyboards?

    Len
    Spread the joy of Vintage Addiction

    -->www.chronworks.com/<--->www.i8008.net/<--

  9. Default

    The retro keyboard idea is something I've started and stopped about 3 or 4 times over the last decade. I think I keep stopping mostly because of the cost of quality keycaps and keyswitches.

    I could share the CAD file/Gerber files of the Datanetics Rev B, if anyone is interested in making a batch. I'm not likely to do it because you basically have to part out 2 Apple II plus keyboards, just to find enough key switches to build one.

    regards,
    Mike Willegal


    Quote Originally Posted by 8008guy View Post
    Oh, and BTW if you design a video card for the Scelbi I am interested in a board.

    Are you going to do a run of any more keyboards?

    Len

  10. #10
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    Dave Fenyes over at osiweb.org has done a run of keycaps for a new OSI keyboard. The OSI uses just a key matrix, we'd been thinking it might be neat to have a microprocessor controller that turns the OSI key matrix into a parallel ASCII keyboard, since those are getting expensive and hard to find. Perhaps there's enough interest between all the different groups that might want vintage-style keyboards to do a larger run and get the price down?

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