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  1. Your new (second) POST card is the same as the...

    Your new (second) POST card is the same as the modern one pictured and described at [here]. So, "03" is the POST code that the 5162' IBM POST stopped at. The "02" is simply the previous code that was...
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    And the keyboard LED's were flashing at computer...

    And the keyboard LED's were flashing at computer power-on when the 5V fuse was blown ?


    Offline, I have assisted members fix the keyboard circuitry on their faulty motherboard. They used a logic...
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    At [here...

    At [here], see the linked image in step 13. If your probe indicates pulses on pin 13 of the 8253 chip, it means that the CPU has started executing the POST and is getting at least as far as step 13....
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    On a TM100-4 that I have, the connector at that...

    On a TM100-4 that I have, the connector at that position has all three pins, and three wires head off to a 'door open/closed' microswitch. Photo follows.

    On a TM100-2A that I have, there is no...
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    Also, the Acme Roadrunner accelerator card at...

    Also, the Acme Roadrunner accelerator card at [here] is fictional too.
  6. The circuit diagram indicates that the base I/O...

    The circuit diagram indicates that the base I/O address of 3F0h is fixed at that address (i.e. no jumper/switch configuration, nor no software control).

    I think the BIOS you are writing of is the...
  7. Sergey's information on his card is at [here...

    Sergey's information on his card is at [here].
    The circuit diagram for the card shows that the card's floppy controller chip sits at the base I/O address of 3F0h, uses interrupt 6, and uses DMA...
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    I think that you should be honest in all of your...

    I think that you should be honest in all of your posts. :-)
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    Are you positive that the noise is related to...

    Are you positive that the noise is related to screen content? You are doing a directory listing of a floppy. When that happens, the spindle motor on the floppy drive turns, raising the amount of...
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    The way you shot the video suggests that the...

    The way you shot the video suggests that the 'unusual' sound is coming from the PSU (rather than say, the motherboard's speaker). Is that so?

    Do you have another PSU that you can try?
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    256K RAM cards are usually designed to go...

    256K RAM cards are usually designed to go somewhere in the motherboard's 0 to 640K address space. There will be switches on the card that control the starting address of the card's 256K block of RAM....
  12. The motherboard on TH99 that you pointed is a...

    The motherboard on TH99 that you pointed is a different motherboard.


    For your motherboard, the 4-pin Berg connector for an 'external' battery is missing. Per post #2, you could solder a 4-pin...
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    Yes, thanks. I will add it. If required, I...

    Yes, thanks. I will add it.

    If required, I will PM you if I need additional information.
  14. The 'CMOS battery replacement' query comes up...

    The 'CMOS battery replacement' query comes up often. The web page at [here] is what I created to answer many related questions. As an example, on some motherboards, to switch to use of the 4-pin...
  15. I have done some experimentation, and am creating...

    I have done some experimentation, and am creating a web page of the results. See [here].
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    That sounds like one of the error codes that some...

    That sounds like one of the error codes that some Miniscribe hard drives display.

    At [here] is a manual for the Miniscribe 8425. Chapter 10 of that manual (within, search for "10.2MESSAGE...
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    Normally, in this kind of situation, you first...

    Normally, in this kind of situation, you first isolate cause to unit. Is it the card or is it the monitor? You wrote, "The card works with another monitor.", which on reflection, is not enough...
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    Per [here...

    Per [here], there is no setting of the IBM 5160's motherboard switches for zero RAM.

    But there is something else you can do. Your motherboard has 640 KB of RAM fitted, and so it must be the...
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    A couple of other ideas are shown in posts #5 and...

    A couple of other ideas are shown in posts #5 and #6 of the earlier thread at [here].
  20. I have had to do repairs like this in vintage...

    I have had to do repairs like this in vintage keyboards. For each damaged track, I would use a scalpel (fitted with a curve edge blade) to slowly scrape away the track coating on both sides of the...
  21. Part of the story: ...

    Part of the story:

    http://minuszerodegrees.net/temp/6/temp_sea8ncv340bvgt51786fnd1m-vnb2859.png
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    If you are writing about the 40-pin DIL IC...

    If you are writing about the 40-pin DIL IC socket, I see "80C287" (i.e. a maths co-processor) printed above the socket.
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    So I brought out a 64KB-256KB 5150 motherboard. I...

    So I brought out a 64KB-256KB 5150 motherboard. I plugged in an IBM CGA card. No other cards.
    I ran the Supersoft/Landmark diagnostics. As expected, the RAM checks passed.

    I then simulated a...
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    My statement was general and aimed at the OP....

    My statement was general and aimed at the OP.
    Perhaps my statement should have been something like, "The 5150 motherboard can be easily damaged via soldering by someone with little soldering...
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    Welcome to these forums. It is a fact that...

    Welcome to these forums.


    It is a fact that the RAM tests of the Supersoft/Landmark diagnostics can sometimes be wrong or misleading.


    If you were to search these forums for posts where...
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