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    Where are you on this planet? You can put that...

    Where are you on this planet?
    You can put that into your profile via [My Profile][About Me][Location].
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    During the 5160's POST, the POST changes the...

    During the 5160's POST, the POST changes the output state of the PB7 pin a few times. The final state is LOW.
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    The second drive-select position: DS2 if the the...

    The second drive-select position:
    DS2 if the the drive's jumpers are {DS1}{DS2}{DS3}{DS4}.
    DS1 if the the drive's jumpers are {DS0}{DS1}{DS2}{DS3}.


    And per the diagram at [here], the motor-on...
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    Correct. "NO KEYBOARD" does not appear. And I...

    Correct. "NO KEYBOARD" does not appear.
    And I confirmed it again, today.


    What I do is put my multimeter into continuity mode (i.e. beep at low ohms), put one probe on the reference pin, then...
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    Thank you. I have added a pointer to this thread...

    Thank you. I have added a pointer to this thread on [this] page at minuszerodegrees.net
  6. Tantalizingly close, until a tantalum threw a...

    Tantalizingly close, until a tantalum threw a tantrum.
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    Perhaps a personal thing. I would not be...

    Perhaps a personal thing. I would not be replacing that pictured chip based only on its present appearance, but others here might.
  8. I have not seen anything from IBM to that effect,...

    I have not seen anything from IBM to that effect, and I see no technical reason. I can imagine that IBM's standard line was something like, "Use the IBM provided method/s. IBM does not support other...
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    Or, I am a slower typist than you, but had less...

    Or, I am a slower typist than you, but had less to type.

    More patch wire examples at [here].
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    At [here...

    At [here] is an earlier thread on the subject.
  11. At [here...

    At [here] is pictured one that failed (open circuit) on me some years ago.
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    There is a kit for a logic probe shown at [here...

    There is a kit for a logic probe shown at [here]. That probe does no sampling.
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    I think "sampling" is the wrong word to use for a...

    I think "sampling" is the wrong word to use for a logic probe.
    But yes, the 2 MHz quoted for your logic probe is a limit. Beyond that, alternating digital signals may not be expected to show as...
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    I have never needed to do the action. But post...

    I have never needed to do the action.
    But post #3 at [here] is an example of someone doing it.
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    'V ADJ' potentiometer (RT1). In the SAMS...

    'V ADJ' potentiometer (RT1).
    In the SAMS document, read the first block on the 'Miscellaneous Adjustments' page.
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    For the TM100-2A, some people have reported...

    For the TM100-2A, some people have reported fixing a seized/partially-seized stepper by putting WD-40 into the stepper.
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    Quote: "not quite the same". Explain, ideally...

    Quote: "not quite the same". Explain, ideally with examples. And SAMS would have made their measurements under load, and so that should be the basis of the comparison.



    The fact that you asked...
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    War story: Many many moons ago, a fellow...

    War story:

    Many many moons ago, a fellow technician left the workshop that I was a member of, and transferred to me was a dismantled EGA monitor (including a tray of parts [screws, etc.]) that the...
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    Yes, various possibilities. For example, at [here...

    Yes, various possibilities. For example, at [here] is described a 5150 that was displaying 201/301/131 errors, and the cause turned out to be a RAM card.
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    Yes, but you wrote, "Because 301 means faulty...

    Yes, but you wrote, "Because 301 means faulty keyboard anyway.", an incorrect/misleading statement. If not pointed out, some readers (now and later) will learn incorrect information. And sometimes...
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    In an IBM 5160, the 301 error means that the...

    In an IBM 5160, the 301 error means that the keyboard test failed.
    Certain failure modes of the keyboard interface circuitry on the 5160 motherboard can result in a 301 error.
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    Welcome to these forums. Rather than...

    Welcome to these forums.


    Rather than writing, "The PC", it is better to use, "The XT", otherwise some people will get confused, thinking you have an IBM PC.


    There is lots of IBM XT (IBM...
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    Only 8 channels. That is quite limiting. Okay...

    Only 8 channels. That is quite limiting.

    Okay for for something like [this], where only 4 channels are needed (POWER GOOD, PA0, PA1, PA2).

    But, for example, what if you wanted to monitor the...
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    A logic analyzer. Again, like any test equipment,...

    A logic analyzer. Again, like any test equipment, you will need to gain the knowledge of how to use it. You have a functioning 5160 motherboard and so you can use that for learning, and to see what...
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    For the IBM 5160, the sequence of events that...

    For the IBM 5160, the sequence of events that occurs before the POST starts is shown at [here]. To verify that ALL of that is happening, you would need a range of different test equipment (and the...
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