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Type: Posts; User: bear

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  1. Replies
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    I have two 8514s waiting to go on the bench for...

    I have two 8514s waiting to go on the bench for more or less the same problem. That'll save me a lot of effort. Thanks!
  2. It stands to reason, given there are only four...

    It stands to reason, given there are only four pins wired on the bus connector.
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    I'm going to make a vague assertion here, that I...

    I'm going to make a vague assertion here, that I haven't had time to go turn into an actual technical explanation. You've got some non-sync, non-rgb signal coming through to the monitor on one of the...
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    it has to do with the sync signal, and the way...

    it has to do with the sync signal, and the way your cable is wired.

    I could give you a more technically complete answer if you told us which LCD monitor and which NuBus video card you're using.
  5. The MP3000 uses a different I/O bus for the...

    The MP3000 uses a different I/O bus for the channel cards than the P390 or 3006 IS.
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    862

    Anecdotally: The Leading Edge Model D2 (6/8/10...

    Anecdotally:

    The Leading Edge Model D2 (6/8/10 MHz) does require the 8 MHz clock for the onboard FDC, but it doesn't change the CPU's operating frequency when the FDC is active. Mine had a fault...
  7. I stand corrected, and a reminder to myself that...

    I stand corrected, and a reminder to myself that "almost none" is not mathematically equal to "none at all".
  8. Thread: IBM 5170 Issue

    by bear
    Replies
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    917

    Or maybe ceramic disc capacitors are, by their...

    Or maybe ceramic disc capacitors are, by their very physical characteristics, naturally low-capacitance, high-voltage devices. I can't even find a ceramic disc currently in production and for sale on...
  9. If your 1084S is one of the ones that supports...

    If your 1084S is one of the ones that supports TTL RGBI, yes, I'm pretty sure it can be wired to the card using the DIN connector, and the card can use it as a CGA monitor with no brown, or EGA with...
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    so that people could use DIMMs from their...

    so that people could use DIMMs from their PowerMacs.
  11. Replies
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    413

    https://www.ebay.com/dsc/i.html?_armrs=1&_from=R40...

    https://www.ebay.com/dsc/i.html?_armrs=1&_from=R40&_sacat=0&LH_TitleDesc=1&_nkw=%22keyboard+adapter+module%22+-%28arduino%29&_sop=10

    They're not always this expensive. Keep watching, one'll turn...
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    736

    It's not a clone, it's compatible to some degree....

    It's not a clone, it's compatible to some degree. In practice that means your program that supports the IBM PGC might work (ACAD) or it might not (Generic CADD). The Matrox is less compatible than...
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    Regardless of where it is (was) in the Matrox...

    Regardless of where it is (was) in the Matrox FTP, that's the software for the PG-series cards.
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    Discrete. I blew one by carelessly...

    Discrete. I blew one by carelessly plugging/unplugging disk drives while the machine was on.
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    It's probably not a bad idea to check the PSU,...

    It's probably not a bad idea to check the PSU, but tantalum capacitors short when they fail, and when they short, they burn (or explode). This sounds pretty normal to me, except that a lot of the...
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    On the IBM EGA board, neither RCA connector...

    On the IBM EGA board, neither RCA connector provides a television-style composite output. The PEGA could do something different, but odds are... it doesn't.
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    Pkzip.

    Pkzip.
  18. Replies
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    It'll be a capacitor outside the power supply,...

    It'll be a capacitor outside the power supply, and you can't tell by looking. You don't need an ESR meter, the offending part will be a dead short ...if that's the problem.
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    classic failure mode for tantalum capacitors.

    classic failure mode for tantalum capacitors.
  20. I can help with tapes and docs.

    I can help with tapes and docs.
  21. I am fascinated that it can matter to a drive...

    I am fascinated that it can matter to a drive whether the format is MFM or GCR. Is this a noise filter or AGC type problem?
  22. The head alignment is completely standard,...

    The head alignment is completely standard, otherwise the catweasel couldn't read 400/800k disks. You are having some other problem.
  23. My Everex Step 486 with a missing battery is...

    My Everex Step 486 with a missing battery is similarly slow at POST until the CMOS is initialized correctly, then returns to normal for subsequent reboots.
  24. On a 386sx with 30-pin SIMMs, one bank of memory...

    On a 386sx with 30-pin SIMMs, one bank of memory is two SIMMs. It's not going to work right with just one, no matter what. You may have other problems with the board, but this one is at least easy to...
  25. it's a "tripole" tantalum capacitor. Three legs...

    it's a "tripole" tantalum capacitor. Three legs are a conceit for automated assembly; it can't be inserted with reverse polarity. You can replace it with a "normal" two leg tantalum capacitor, no...
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