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Type: Posts; User: Joe Zwerko

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  1. It will be an upgrade. The problem is that the...

    It will be an upgrade. The problem is that the dual CompactFlash adapters are getting hard to find. I still have a pretty big inventory of them, but still, I have to think of the future.

    So the...
  2. My current project is trying to motivate myself...

    My current project is trying to motivate myself to convert all the MISE/M3SE applications and utilities for the new Wireless/SD module.
    The hardware is done, but the software conversion is a drag. ...
  3. Poll: More advice: get a cheaper PCB supplier. My...

    More advice: get a cheaper PCB supplier. My largest board, the MIRE, costs less than $6 including delivery from PCBway, with immersion gold. It's about 7" x 6.5".

    Edit
    ----
    Just realized you...
  4. Poll: A word of advice: buy more components than you...

    A word of advice: buy more components than you think you're going to need. Purchased in volume, a hundred resistors or capacitors don't cost much.
    There's clearly a strong demand for Talker/80, and...
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    The surprising thing is that they still stock a...

    The surprising thing is that they still stock a switch that old. I don't know whether they still manufacture it... maybe they just have a big box of them kicking around.
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    Believe it or not the manufacturer, Oslo Switch,...

    Believe it or not the manufacturer, Oslo Switch, will send you a sample of a replacement 4P power switch for free. At least, they sent me one.

    Model number (US version) is CRTL11A125V1M9

    It's...
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    After a closer look at the circuit board in your...

    After a closer look at the circuit board in your photos, the SIP in back of the card edge connector puts 5.6Kohm pullups on all 8 data lines. The 74LS00 chip is powered by the (pulled high)...
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    That must be the Model III version of the Alpha...

    That must be the Model III version of the Alpha Products Joystick. It had one chip (a 7400 or 74LS00) that decoded and responded to ANY I/O port.
    ...
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    The 0x14 and 0x65 are the directory cylinder...

    The 0x14 and 0x65 are the directory cylinder numbers.
  10. Somewhat off-topic. I once hooked Eliza (non...

    Somewhat off-topic.
    I once hooked Eliza (non Voice Synthesizer version) into the Zippy random phrase generator and witnessed some bad psychoanalysis.
  11. Voice synthesizer phoneme mappings. 59549

    Voice synthesizer phoneme mappings.

    59549
  12. Maybe 12 or so years ago I built a clone that was...

    Maybe 12 or so years ago I built a clone that was compatible with both the VS-100 and the Radio Shack Voice synthesizer. However it still needed the Votrax SC-01A chip, which would require a Great...
  13. The Radio Shack Voice Synthesizer also used the...

    The Radio Shack Voice Synthesizer also used the Votrax SC-01A chip. It interpreted writes to the last 32 bytes of screen memory as letters representing phonemes, and had a small ROM to translate...
  14. The WAIT* signal to the Z-80 CPU is not driven by...

    The WAIT* signal to the Z-80 CPU is not driven by anything in the Model I keyboard or Expansion Interface except a 4.7 Kohm resistor to 5V to make its default state inactive. So no wait states on...
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    Most of those were destroyed in the...

    Most of those were destroyed in the inter-galactic wars.
  16. In case anyone is interested, I did...

    In case anyone is interested, I did machine-language speedups to the original games (Temple of Apshai and Hellfire Warrior) quite a few years ago. This vastly improves the drawing speed and disk...
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    Get some 4116s (eBay search "4116 DRAM") and make...

    Get some 4116s (eBay search "4116 DRAM") and make sure the +5, +12, and -5V supplies are adjusted to within tolerance. The speed grade doesn't much matter since the Model I used pretty much the...
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    You have to be fairly choosy when selecting the...

    You have to be fairly choosy when selecting the card edge connectors if you expect to attach an FDC cartridge without modification.

    The FDC carts have narrow slots in their PCBs next to the card...
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    Just a follow-up. I installed Mike's switch and...

    Just a follow-up. I installed Mike's switch and it worked great.

    Before Christmas I had also requested a sample from Oslo Switch, and to my surprise the darned thing arrived today.
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    Mike, The 4P power switch showed up today in...

    Mike,

    The 4P power switch showed up today in perfect condition. Thanks again!

    Pete.
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    I appears that finding a switch that matches the...

    I appears that finding a switch that matches the shape and size of the original is going to be difficult if not impossible. Looking on mouser.com (which has a LOT of different rocker switches)...
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    Model 4P power switch?

    Anyone know of a modern replacement for the Model 4P power switch? The light in mine went out, and when I switched it off and back on slowly the light came on but it made the sizzling noise and...
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    Thanks, Jay.

    Thanks, Jay.
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    Tandy Assembly: Soldering Station?

    Will anyone at Tandy Assembly next month have a soldering station set up? I'm bringing a fairly delicate prototype device that could need repairs, but I'm flying in so I can't bring my own soldering...
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    DeoxIT... that's what it's made for. ...

    DeoxIT... that's what it's made for.

    https://www.amazon.com/Hosa-D100S-2-DeoxIT-Contact-Cleaner/dp/B0014F110I
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