Tube Time

@TubeTimeUS

vacuum tubes, vintage computers, the MOnSter6502, memes, and other detritus.

Silly Valley
Inscrit en mai 2011

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  1. Tweet épinglé
    15 mai 2017
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  2. il y a 10 heures

    bonus shot of the card (far left) in my rev A 5150.

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  3. il y a 10 heures

    what are those traces for? they are RGB wires. i connected this early MDA card up to my NEC MultiSync monitor, and sure enough, it does color!

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  4. il y a 10 heures

    most importantly, they removed a bunch of traces going to the video connector.

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  5. il y a 10 heures

    the old one also has a light pen connector, J2. IBM removed it on the later card.

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  6. il y a 10 heures

    the old one has a black bracket as well as some bodge wires.

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  7. il y a 10 heures

    here's an early rev 1 MDA card (bottom) compared with a later one (top).

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  8. il y a 16 heures

    it uses an early 8088 CPU with an interrupt bug. apparently this makes my PC one of the first 200,000 shipped!

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  9. il y a 16 heures

    on the memory card, i had to reset a PAL in it's socket. it works now.

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  10. il y a 17 heures
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  11. il y a 17 heures
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  12. il y a 17 heures
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  13. il y a 18 heures

    whoah. DOS 1.10 with 64K of RAM!

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  14. 9 sept.

    it's the device's fault!

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  15. 9 sept.

    check out this dot-matrix printer, in slow motion! it's an IBM 5152 which is just an Epson MX-80 with the IBM logo slapped on.

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  16. 9 sept.

    it contains an 80C48 MCU and a...555 timer? 🤔

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  17. 9 sept.

    straggler from yesterday: The Smartest Mouse In The World!

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  18. 9 sept.

    another vague memory: Sketch used a 2-dimensional array of function pointers to perform actions on objects, something like action[LINE][ERASE](object). it compiled to a jump table which was quite fast!

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  19. 9 sept.

    looks like some of the bits are missing.

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  20. 9 sept.

    just remembered another trivia item. the code consistently used "colour" instead of "color."

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  21. 9 sept.

    iirc AutoSketch was replaced in the late 90s when Autodesk acquired Softdesk. they dropped the existing product and renamed a Softdesk product AutoSketch. ohhh, marketing. 🙄

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