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Type: Posts; User: shank

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  1. Communication Multiplexer -- 68000 Conversion

    Submitted for your approval, one Radio Shack Communication Multiplexer converted to a 68000 system....

    An interesting morning... This is the first time in 30 years that I've opened the top of...
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    Thanks! I've been having a good time with it,...

    Thanks! I've been having a good time with it, too... I should have been done with it by now, but I keep taking these tangential excursions and using the M16 as more of a test bed than a...
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    I think so since with a wiring adapter the...

    I think so since with a wiring adapter the keyboards are interchangeable. Timing is the same between the two keyboards.

    The additional F keys need to be accounted for in my software, but that's...
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    53938

    53938
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    OK, this clears some questions up. You've been...

    OK, this clears some questions up. You've been level shifting with the Ableconn and we know that works with a modern laptop. Good.

    It would be really helpful to see what's going on with the...
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    I don't suppose that you have an RS-232 break out...

    I don't suppose that you have an RS-232 break out box so you can see exactly what's happening on the lines? Or, scope, or something...

    I'll admit that it's been some time, but I don't recall...
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    Some things to check into: The Pi serial and...

    Some things to check into:

    The Pi serial and the Model IV RS232 signal levels are not compatible. You need a level shifter of some kind. A USB/serial adapter on the Pi side might be an option for...
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    Fixing the Motorola card... I'd been working...

    Fixing the Motorola card...

    I'd been working with the machine when the video failed. Loud whine concurrent with a quick flash at the center of the crt face. My money was on a horizontal output...
  9. It was a 486 based GRiD Tower UNIX development...

    It was a 486 based GRiD Tower UNIX development box. I don't recall the exact nomenclature. There was another that served the whole department. We used them precisely because they were so big--we...
  10. Thanks for the info! I have parts coming that my...

    Thanks for the info! I have parts coming that my square it away including what I hope is a reasonable sub for the horizontal output transistor.
  11. Have an extra M16 Motorola CRT card or keyboard REPEAT keycap laying around?

    Title pretty much says it all...

    The Motorola CRT card in my M16 restoration project bit the dust and I'd just as soon not troubleshoot it right now. So if you've got an extra you'd like to get...
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    i had a beehive terminal as well... loved it!

    i had a beehive terminal as well... loved it!
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    Anyone have a REPEAT key off of a Model II type...

    Anyone have a REPEAT key off of a Model II type keyboard they'd be willing to part with?

    53669

    Also wondering if someone would like to trade a 6000 style card extender for a Model II/16 type?
    ...
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    It's a nice machine! Hope you enjoy working...

    It's a nice machine! Hope you enjoy working with it!
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    Been awhile... Back to it! Let's change out...

    Been awhile... Back to it!

    Let's change out some keyboard pads.

    53620 53621

    In the second photo above, the yellowish disk is the plastic disk that's clipped into the bottom of the well. ...
  16. Thread: Model 4 Font

    by shank
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    i've seen buffer devices, such that there are...

    i've seen buffer devices, such that there are multiple buffers/inverters in a package, short inputs or outputs internally. it's an odd failure, at least to me, but i saw quite a few of these...
  17. Thread: Model 4 Font

    by shank
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    I don't have a schematic handy, but looking at...

    I don't have a schematic handy, but looking at your screen shot... If i'm counting right, it appears that the character generator only outputs a 7th character column of dots (counting left to right)...
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    It's a close approximation of the Model II/16...

    It's a close approximation of the Model II/16 keyboard by a PS/2 keyboard. I've mapped all the keys so that they provide the correct bits, e.g., F1/F2, arrows, CTRL/KEY combinations, BREAK... I...
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    In a perfect world I'd have all sorts of time to...

    In a perfect world I'd have all sorts of time to mess with the M16... Alas...

    So, back to it. I have the foam to fix the keyboard but haven't gotten to that yet, but did want to run some...
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    i looked it up--won't sling and won't attract...

    i looked it up--won't sling and won't attract dust.. looks about perfect. nice tip!
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    Exactly so!

    Exactly so!
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    cleaning disk drive heads is good, IMHO greasing...

    cleaning disk drive heads is good, IMHO greasing rails in a drive is not so good. definitely clean them. if they're pitted or rough you can use crocus cloth to polish them up and smooth them out...
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    Quick update... Not much to report. System...

    Quick update... Not much to report. System boots, drives work now... Mem II runs well when I can coerce the keyboard into cooperation. Foam pads are toast and I'm waiting on a kit to fix it up. ...
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    52704

    52704
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    Had some time and made a bit of progress... Time...

    Had some time and made a bit of progress... Time to pull the drives out and do a swap (I hated swapping drives in the Model 16). I'd also forgotten how much I disliked the tight quarters where we...
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