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Just as exciting today...

Discussion in 'Off Topic' started by mark tomlinson, Feb 9, 2018.

  1. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    To open a box from JameCo as it was in 1982 :) (A bit more EXPENSIVE, true...)

    20180209_124220.jpg
     
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  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    And most of those are 'in case we need them' bits for this (at least one we DO need, the rest are as yet ... not all tested. I just hate ordering one 79 cent part) :

    20180209_124733.jpg


    Bonus points if you name it :)
     
  3. Geof

    Geof Volunteer Moderator
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    TI 99? lol only thing I can think of in that era :D

    edit: 2nd guess apple 2 but looks like its short a few keys lol
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    A bit large even for that :)


    Close, but actually pre-dates the Apple II and is just after the Apple I
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    https://en.wikipedia.org/wiki/Ohio_Scientific

    C1P with the Superboard II :)

    I actually had a C8P that I finally junked years ago since it was in far worse shape and was more complicated to work on. For just restoration it was not worth it.
     
    #5 mark tomlinson, Feb 9, 2018
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  6. Geof

    Geof Volunteer Moderator
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  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Amazingly, all 5v TTL logic and all chips are still available today -- even the 1kx4 bit static RAM chips :)

    P.S. and I did get it to boot into Microsoft Basic :) Just working on a few minor issues. Had to find an old TV with a composite input ... crikey!
     
  8. Geof

    Geof Volunteer Moderator
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    That might actually be more terrifying than anything...dollars to donuts its left over stock from that year? ;)
     
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    If you zoom in on the 4 medium sized chips on the bottom half next to the keyboard you will note that this is where Basic lived back then :)

    CloseUp.jpg
     
    #9 mark tomlinson, Feb 9, 2018
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  10. Geof

    Geof Volunteer Moderator
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    LOL :D :p old tech...best tech? :D
     
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    6502 baby, 6502 :)
     
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  12. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    I had two Atari 800's they were 6502's also, long since gone. wished I still had one of those.
     
  13. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    So after replacing all the static RAM and a few other chips and sockets we were stymied by garbage on the display. Some good text, but a lot of garbage. Much fapping about with swapping RAM in and out of the video mapping address, different speeds, etc. Finally took a microscope to the one socket we replaced and darned if there were not a couple of minor trace jumps from the socket rework. Very tiny, not visible without the scope. A razor knife and back in business (three days later). Will boot to the monitor prompt.

    Now we are having issues with a number of the keys not responding and it looks like they are just suffering from a case of the 'olds'. Ordered new ones... see what happens if we just swap them all out :) These are old-skool mechanical ones that are not easily disassembled. With a set of replacements I may try to salvage some of the originals, but that won't be a holding item
     
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