Tube Time

@TubeTimeUS

vacuum tubes, vintage computers, the MOnSter6502, cross-sectioned electronic parts, memes, and other detritus. BNC stands for Baby Neill Constant.

Silly Valley
Vrijeme pridruživanja: svibanj 2011.

Medijski sadržaj

  1. prije 2 sata

    another look at the printer mechanism. you can just barely see the copper coils (middle) that drive one of the print head pins.

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  2. prije 2 sata

    the printer mechanism

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  3. 3. velj
    Odgovor korisniku/ci
  4. 2. velj
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  5. 2. velj

    last thing is to fix the LED connection.

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  6. 2. velj

    aaaand we have data! this is a test disk, and it's just single sided.

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  7. 2. velj

    stepper motor works

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  8. 2. velj

    RPM sensing works. let's see about data modes...

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  9. 2. velj

    board swapped. let's see if it works

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  10. 2. velj

    the drive already has a logic board but it's this weird custom HP thing that has a proprietary disk interface. time for it to go.

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  11. 2. velj

    typically these drives use a shorting block (the black thing with the jumpers you can cut) but im using a switch bank instead. H/T for this trick.

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  12. 2. velj

    ooh, it's 35 configuration jumpers. this may take a while... 😂

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  13. 2. velj

    better. the SA850 has around 20 configuration jumpers. time to check the manual and make sure they're all set right.

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  14. 2. velj

    first though a bunch of these test points had snapped off, so i gotta swap those out for fresh ones.

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  15. 2. velj

    this afternoon's project: replacing the logic board in my Shugart SA850 8" floppy drive. this board i got from .

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  16. 2. velj
    Odgovor korisniku/ci

    they're surprisingly stable across a wide temperature range. 🙂

  17. 2. velj

    let's look at it in slow motion

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  18. 2. velj

    on a scope, you can see the sine wave it creates. if you overdrive it, the reed bounces against the limits and the waveform distorts.

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  19. 2. velj

    it's a little hard to hear so i put a plastic card to amplify it

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  20. 2. velj

    inside is a tiny metal reed!

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