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Type: Posts; User: mkemp

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  1. Replies
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    IBM 5162 XT-286 memory

    After succesfully getting an 896k 5160 XT working I cast an eye at my XT-286. "How cool would it be to replace the 256k SIMMs with 1m or 4m," I thought.

    It turrns out that the 256k SIMMs aren't...
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    Can you pass the word to Nigel and crew that it's...

    Can you pass the word to Nigel and crew that it's available? I'm not familiar with them.
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    709

    Unknown Unisys(?) board identification

    Anybody know what this is?
    The compnent on the right (unk-D) looks like a thin shiny aluminum hollow package with

    DO NOT PRESS ON LID
    UNISYS 2835 36D5
    8908 5017
    painted on it. All my attempts...
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    Thanks to al who responded. Since there is...

    Thanks to al who responded. Since there is interest, I'll be putting these items up for auction on this site if I can figure out how, or on eBay.
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    I haven't attempted changing the xtal yet. The...

    I haven't attempted changing the xtal yet. The only real changes in system are the 10mhZ 80286 and the patched BIOS. Well, and the power supply but that was just fixing what was broken.

    I did find...
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    That's the way it was described on an IBM...

    That's the way it was described on an IBM internal repository when I worked there. From the wiki about the 5170 AT: "Many customers replaced the 12 MHz crystal (which ran the processor at 6 MHz) with...
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    IBM XT-286 5162 speedup

    My XT-286 has a 10mHz 80286 chip in it plus a patched BIOS without the 'speed bump' that should allow for clock speeds greater than 6mHz.

    Has anyone tried this and, if so, what kind of speed could...
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    FS/Interest check

    I seem to have some vintage stuff that I don't think I'll ever use.


    Two Microsoft Mach-10 accelerator boards for 8088 PCs and XTs. They have Microsoft mouse ports and a socket for an external...
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    No reason why not, except for the memory card...

    No reason why not, except for the memory card limitation Chuck(G) mentioned. I don't remember what else won't work in one. What would you put in them, though? About the only thing I can think of are...
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    The board's designed for 256k chips, so don't put...

    The board's designed for 256k chips, so don't put anything else in there!
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    Agile Project of Galileo (United Airlines...

    Agile Project of Galileo (United Airlines reservations system).
    I was hired "for a couple of months to help finish up."
    The project was cancelled eleven months later as a complete failure.
    I've...
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    I have a cute little square heatsink for the CPU...

    I have a cute little square heatsink for the CPU and a long-and-skinny one that'll fit the FPU. They both heat up, so they both get heatsinks.
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    Thanks to all who replied. I think I'll just...

    Thanks to all who replied. I think I'll just stick heatsinks on the CPU and FPU and forget about fans for the moment.
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    80286 temperature

    I've just about gotten my tricked-out XT-286 finished. When I had it running for a while I noticed that the CPU and FPU are hot to the touch, too hot to keep a finger on.

    The XT-286 is running...
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    Okay. That'll mean cleaning out the system unit...

    Okay. That'll mean cleaning out the system unit looking for dust that the vac doesn't move?
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    No bad caps that I could see, unless they're...

    No bad caps that I could see, unless they're inside the power supply. Worth looking? Is there a fuse inside?
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    Good news: the Commodore system unit and monitor...

    Good news: the Commodore system unit and monitor (Magnavox RGB monitor 80) work and the diskette drive lights come on
    Bad news: the Apple's power supply seems to be shot - I popped open the top...
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    I'll go get it all out of the car, assemble them...

    I'll go get it all out of the car, assemble them and see it they work. Pix and update Real Soon Now.

    [new keyboard, \full of t7pos]
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    Commodore 128 and Mac LC III

    "I found a couple of old computers in the shed. Do you want them?"

    Complete with monitors, a couple of original boxes that seem to be Apple diskette drives, power bricks, cables and a box of paper...
  20. Thread: Clock generator

    by mkemp
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    I found this:...

    I found this: http://www.electronic-circuits-diagrams.com/oscillatorsimages/oscillatorsckt1.shtml
    I'll keep looking.
  21. Thread: Clock generator

    by mkemp
    Replies
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    943

    Clock generator

    The "underclock" thread prompted me to ask: is there an inexpensive thing that could substitute for the clock crystal of a PC, XT or 286 and vary the freq, say from 2 to 30mHz? My thought would be to...
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    Caution: the two ROM sockets are for 32k memories...

    Caution: the two ROM sockets are for 32k memories and mapped to F000 and F800. IBM's ROM BASIC takes up all of both chips except for the 4k(?) ROM BIOS at the high end of the high chip. YMMV with a...
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    Well, that grinding noise is my assumption...

    Well, that grinding noise is my assumption derailleur changing gears. Thanks.
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    That's interesting. I've read that the standard...

    That's interesting. I've read that the standard XT FDD adapter isn't fast enough for a 1.44 drive and I wouldn't think that a 16-bit AT adapter would work in an 8-bit XT slot. I have several DTK...
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    That's true. About the only ROMs I'd need to copy...

    That's true. About the only ROMs I'd need to copy are the ones from controllers for 3.5-inch floppies and a hard disk, either a SCSI adapter or an XT-IDE. YMMV depending on the cards you want to use...
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