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    That is what IBM has done on my keyboard.

    That is what IBM has done on my keyboard.
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    It is the reset line. It goes to pin 3 in the DIN...

    It is the reset line. It goes to pin 3 in the DIN connector (the pin opposite CLOCK). I verified that by opening up one of my 83-key keyboards.

    Refer to [here]. The early version of the 83-key...
  3. R45 is probably acting as a 'pullup resistor'. I...

    R45 is probably acting as a 'pullup resistor'. I do not think that you have worked out the full diagram, because I expect that there is a second pullup resistor, one for the clock line. And other...
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    1. Do a thorough visual inspection. 2. Very...

    1. Do a thorough visual inspection.

    2. Very carefully, re-seat all socketed chips.

    3. Some motherboards like these will appear 'dead' if there is one (or more) faulty RAM chips in bank 0.

    4....
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    Welcome to these forums. Why do you write...

    Welcome to these forums.


    Why do you write that? Are you hearing a beep/beeps from the speaker ?


    That could be the processor in the keyboard doing that.


    I cannot see any other place on...
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    A link to Chuck's later version, version 0.94...

    A link to Chuck's later version, version 0.94 (XTATKEY_094.ZIP) is at [here].

    A slightly enhanced version of that is introduced at [here].
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    One possible cause for a motherboard reboot is...

    One possible cause for a motherboard reboot is the POWER GOOD signal from the power supply (see [here]) going low then returning to high.

    Some things might trigger that:
    1. Unstable mains power...
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    OS/2 Warp - No doubt intended for installation on...

    OS/2 Warp - No doubt intended for installation on the Enterprise's warp drive.
  9. The following measurements may prompt you to do...

    The following measurements may prompt you to do further research.

    12" x 8.5" = IBM PC (5150) and IBM Portable PC (5155) and IBM XT (5160) motherboard [As measured by me.]

    13.8" x 12" = IBM...
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    "Lurch has exceeded their stored private messages...

    "Lurch has exceeded their stored private messages quota and cannot accept further messages until they clear some space."
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    A bad video switch on motherboard? E.g. Settings...

    A bad video switch on motherboard? E.g. Settings made for CGA, but because of the bad switch, BIOS thinks you have MDA, and beeps because it cannot find an MDA card.

    Just in case, according to...
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    No alcohol involved nor needed. People tell me...

    No alcohol involved nor needed. People tell me that my humour is 'warped'. Luckily for me, it's not warped enough to have me committed to an asylum. Yes, I understand that some people will disagree....
  13. IBM 5150 and 5160 - Motherboard's video switches set incorrectly

    I did some experimentation.
    The results are in the table at [here], which shows the symptoms of having an IBM 5150/5160 motherboard's video switches set incorrectly.
    Of interest:

    * Not all cases...
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    If I see 5161 support code in a 5150 or 5160...

    If I see 5161 support code in a 5150 or 5160 BIOS, that code simply enables the extender card during the power-on self test (POST). Per [here], that line may not (repeat: may not) be required because...
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    Thank you. The manual is now hosted at...

    Thank you. The manual is now hosted at http://minuszerodegrees.net/manuals.htm#Compaq
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    "ALLOY" is on the card. From the Internet, "At...

    "ALLOY" is on the card.
    From the Internet, "At one point Alloy was a major producer of QIC format tape drives .."
    So perhaps an Alloy made QIC drive.
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    Some thoughts of mine

    http://minuszerodegrees.net/thoughts/rays_thoughts.htm
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    The minuszerodegrees.net page for the IBM/Xebec...

    The minuszerodegrees.net page for the IBM/Xebec controllers does not show all workable configurations. It shows the common configurations. For example, you indicate that you have placed (physical)...
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    The maintenance manual for the T4700CT is at...

    The maintenance manual for the T4700CT is at [here].
    The description of chapter 4 includes, "This section explains how to disassemble the T4700CS/T4700CT/T4800CT"
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    The diagram that you have pointed to is only part...

    The diagram that you have pointed to is only part of the story. The full story is at [here], where there are multiple options.


    Terminator on the drive that is at the end of the cable, and no...
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    Per [here...

    Per [here], that will be a 1982 dated upgrade (10/27/82).



    Ruud's soon-to-be-modified diagnostic may reveal a bad RAM chip (or chips) in bank 0, however I am curious about the long beep you are...
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    I think you will have seen the startup sequence...

    I think you will have seen the startup sequence at [here].

    As expected, you are 'diving deeper' in your diagnosis. At a certain point, you will need to acquire better test equipment, as well as...
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    Which of the three possible IBM BIOS' do you have...

    Which of the three possible IBM BIOS' do you have on your 16KB-64KB motherboard ?

    What does Ruud's diagnostic ROM (found [here]) report ?
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    Do you know for fact that the motherboard is...

    Do you know for fact that the motherboard is faulty, or you making an educated guess based on what you are reading ?

    And of course, components other than capacitors can emit smoke. I have found...
  25. Thread: Toshiba T1100.

    by modem7
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    I tried it. It works nicely. Photo at [here...

    I tried it. It works nicely. Photo at [here].
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