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
Joined May 2011

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  1. Pinned Tweet
    15 May 2016

    so i made a thing. a very big PCB with 4304 components. A 6502 microprocessor.

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  2. 13 hours ago

    i just realized that i forgot to test the write circuit. and it's all put away now. well, i'll just have to test it next time. 🤪

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  3. 13 hours ago
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  4. 14 hours ago

    last thing is to fix the LED connection.

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  5. 14 hours ago

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

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  6. 14 hours ago

    stepper motor works

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  7. 14 hours ago

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

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  8. 14 hours ago

    board swapped. let's see if it works

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  9. 14 hours ago

    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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  10. 14 hours ago

    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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  11. 15 hours ago

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

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  12. 15 hours ago

    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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  13. 15 hours ago

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

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  14. 15 hours ago

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

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  15. Retweeted
    18 hours ago
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  16. 22 hours ago
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  17. Retweeted
    Feb 1

    This Commodore 1351 mouse for used to work great. Now it doesn’t seem to move left. Time to take it apart.

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  18. Feb 1

    nowadays radios generate the tones digitally instead of using an actual, physical resonator. you can pick a wide variety of frequencies and you don't have to swap out the tone reed modules.

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  19. Feb 1

    CTCSS works by sending a tone (like 192.8Hz) along with my voice whenever i TX and key up my mic. the RX side's squelch (aka mute, so you don't hear white noise when nobody is talking) will stay muted unless it also hears that exact tone.

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  20. Feb 1

    CTCSS=continuous tone-coded squelch system: let's say we have 10 radios (all on the same frequency) and we divide them into two groups using two different CTCSS tones. in my group i only hear my five buddies, and i cannot be heard by the other group.

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  21. Feb 1

    let's look at it in slow motion

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