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Type: Posts; User: Chuck(G)

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  1. Replies
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    As long as the sound remains inside the car and...

    As long as the sound remains inside the car and doesn't pollute the environment like some guy with juiced-up bass on his ride cruising through your neighborhood at 3 AM... If the driver wants to...
  2. I'm not doubting that this could have been done...

    I'm not doubting that this could have been done in various ways that didn't involve tubes or transistors. I remember that a do it yourself morse typewriter from an issue of Radio Electronics in...
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    I had a need for a small SATA hard drive power...

    I had a need for a small SATA hard drive power supply for a test. I looked in my hellbox and turned up a wart for a Compaq 14" LCD display (very early; the backlights eventually went dim and it...
  4. Talk to Bruce Ray at Wild Hare computers...

    Talk to Bruce Ray at Wild Hare computers. He's a font of knowledge and gear for all things DG.
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    Ah, AVRs--old-school MPUs. ARM MCUs can run...

    Ah, AVRs--old-school MPUs. ARM MCUs can run faster and usually have more capabilities.

    I'm not against using the occasion AVR or even 8-bit PIC for a quickie, but for serious stuff, ARMs are the...
  6. Thread: Pcw9512

    by Chuck(G)
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    That's what prompted me to get rid of my PCW. ...

    That's what prompted me to get rid of my PCW. You can't even plug a garden-variety parallel or serial printer into it without a special adapter. The big attraction for me was the 512KB memory...
  7. I guess folks aren't following my thinking. ...

    I guess folks aren't following my thinking. This is, in effect, a keystroke-to-code translator with buffered memory. Note the dial on the front of the unit--it meters the amount of memory used.
    ...
  8. Annabooks published a complete volume on doing...

    Annabooks published a complete volume on doing your own PC BIOS back in the day.
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    I'm not following your logic. Surely, if you can...

    I'm not following your logic. Surely, if you can maintain the appropriate bitrate, you can approximate what you need using the PWM capability of your MCU (most relatively modern ones have that...
  10. Thread: Pcw9512

    by Chuck(G)
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    160

    Not so confusing if you consider that, IIRC, the...

    Not so confusing if you consider that, IIRC, the small bootstrap is actually part of the printer controller IC. You won't find any EPROMs on that thing. Text is constructed by software, so it can't...
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    Some folks look back with nostalgia on the old...

    Some folks look back with nostalgia on the old days, but not me.

    I don't miss changing 14' wide printer ribbons and getting ink all over a clean shirt. I don't miss slipping in a pool of oil from...
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    I'm forced to admit that this is the first time...

    I'm forced to admit that this is the first time in my experience that someone has asked for floppy noise to simulate. What's next? Simulation of a high-speed train printer with an open cover? An...
  13. No problem; if you look at the first photo in #7,...

    No problem; if you look at the first photo in #7, you'll see that his machine is connected to an ordinary telegrapher's click-clack sounder. Old telegraphers went by clicks and not beeps--and most...
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    Article on the late Bob Pease's hoard

    Bob's prototypes and other stuff

    I know that analog stuff doesn't interest many here, but Bob was legend.
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    So, are the tape drivers Everex-specific or are...

    So, are the tape drivers Everex-specific or are they just ASPI or CAM interfaced bits? If the latter, almost any SCSI controller might do.
  16. Thread: Pcw9512

    by Chuck(G)
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    19
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    Well, a 3.25" drive probably would fit also. :)

    Well, a 3.25" drive probably would fit also. :)
  17. This thing was exhibited at the 1915 San...

    This thing was exhibited at the 1915 San Francisco exhibition. What the heck was FSK then?

    No, this is simple dot-dash make-break old-style telegrapher code.
  18. Found the patent--took a bit of doing, though. ...

    Found the patent--took a bit of doing, though. The fellow's name is "Edwin H. Piersen" patent 1,359,463. (1920) All I've got so for is an image of the device, but I'll keep looking.

    Here it...
  19. Thread: Pcw9512

    by Chuck(G)
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    19
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    Yeah, I knew there were conversion kits available...

    Yeah, I knew there were conversion kits available when I started to receive 3.5" disks from PCW owners. Maybe it wouldn't have been so bad had the the original CF2 drives not been rubbish.
  20. I found a mention and illustration here...

    I found a mention and illustration here.

    ca. 1925. You can see the drum quite clearly. There's a 1925 Pop Sci article that this was essentially copied from.

    A very long time ago, I read a...
  21. No, this was purely electromechanical. The drum...

    No, this was purely electromechanical. The drum was visible.

    [quote}Sanford Research Institute’s computer lab, Menlo Park, Calif. [/quote]

    Wonder what the folks at SRI thought of a competitor?...
  22. No, not a latching relay exactly. Just a bunch...

    No, not a latching relay exactly. Just a bunch of pawls that can be flipped one way by the keyboard and read and reset mechanically. AFAIK, no electrical coils involved. What I can't recall is...
  23. Morse code transmitter with memory and keyboard

    I must have read about this in QST or 73 more than 50 years ago, but now, I'm trying to remember the details of this particular machine.

    It consisted of a slowly rotating drum with rows of pawls,...
  24. Thread: Pcw9512

    by Chuck(G)
    Replies
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    If you can find one, a half-height (not...

    If you can find one, a half-height (not third-height) floppy fits the cutout with a minimum of case-mangling and no open gaps. They're uncommon, but they do exist--I have a pair of NEC 720K drives...
  25. That doesn't sound right. Are you sure that's...

    That doesn't sound right. Are you sure that's not a serial port? Parallel port are +5 logic.
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