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  1. The "created reference disks" are also suspect...

    The "created reference disks" are also suspect until proven good.

    I have read things like, "It took me four attempts to create a reference diskette that worked."

    Consider trying REFSTAMP...
  2. One of the tasks of a PC-family POST, is to...

    One of the tasks of a PC-family POST, is to populate certain areas of the BIOS Data Area (BDA). An element of the BDA is a list of the base I/O address of any parallel ports discovered by the POST....
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    I have experienced success by bending the pin a...

    I have experienced success by bending the pin a little, waiting, bending the pin a little more, waiting, bending the pin a little more, ...
  4. Even the IBM AT exhibits that behaviour. With the...

    Even the IBM AT exhibits that behaviour. With the IBM AT, after a bad battery is replaced with new, the only way to remove the 161 and 163 errors is to follow up by executing the SETUP procedure....
  5. PARITY CHECK 2 is usually (repeat: usually)...

    PARITY CHECK 2 is usually (repeat: usually) triggered by RAM parity checking circuitry on an expansion card detecting a parity error. A related diagram is at [here].
    Over the years, other triggers...
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    A multimeter will not show how 'clean' the...

    A multimeter will not show how 'clean' the voltage is, and so your measurement only provides a certain level of confidence. You did not earlier indicate trying a spare PSU, and so I guess that you do...
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    I draw the same conclusion. Note that...

    I draw the same conclusion.


    Note that Cassette BASIC is not some kind of failure fallback for all booting code. For example, when a DOS boot floppy is being booted from, if the boot code finds...
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    What I use is like what is shown at [here...

    What I use is like what is shown at [here], except that there is a hook at each end. One hook onto the ground pin of the IC, and the other hook onto the target pin.


    Refer to the diagram at...
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    In case relevant for later, which motherboard:...

    In case relevant for later, which motherboard: 64-256KB or 256-640KB ?
    In case relevant for later, which video card ?


    Well, except for video card and power supply.
    It is hard for me to believe...
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    So, what purpose was served by writing,...

    So, what purpose was served by writing, "Reseating is not the answer" ?
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    In this case. Because the computer can boot...

    In this case.


    Because the computer can boot to DOS, another possibility is the use of DEBUG or CheckIt, in a particular way, like in the example at [here].
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    In case required later: 1. The manufacturer's...

    In case required later:

    1. The manufacturer's (complete) head alignment procedure is contained in the 'Operating & Service Manual' for the TM100 (found online). The procedure involves the use of...
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    A 'Streaking' symptom is shown in the 8514...

    A 'Streaking' symptom is shown in the 8514 section of [here].
  14. There is conflicting information about what...

    There is conflicting information about what exactly what is incompatible with the 5170's IBM-authored motherboard BIOS.

    1. At [here], I specifically indicate that it is the XUB (rather than the...
  15. Regarding the known problem of an XT-IDE in an...

    Regarding the known problem of an XT-IDE in an IBM 5170. The problem is described in the 'Nil or unstable operation in an IBM 5170 (IBM AT)' area of [here].

    As mentioned earlier, if the problem...
  16. Thread: IBM CGA Card

    by modem7
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    Matches the diagram at the rear of the manual at...

    Matches the diagram at the rear of the manual at [here], a manual provided by member jh1523.
  17. Although, per [here...

    Although, per [here], if the two signature bytes are intact, FDISK /MBR will only rewrite the boot code portion of the Master Boot Record (MBR), not the whole MBR.
  18. According to the installation guide, answering N...

    According to the installation guide, answering N to the "Are you dynamically configuring the drive - answer Y/N" question, gets the controller to use jumper configuration.
    Then, per table B1,...
  19. So, per the installation guide...

    So, per the installation guide for the WD WDXT-GEN2 PLUS, you are doing 'dynamic' configuration.

    Per the guide, you would normally only choose the 'dynamic' route if you had a drive that does not...
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    That documentation is for the later T2100. The...

    That documentation is for the later T2100.
    The earlier T2100 (8086 based) is pictured at [here].
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    Just in case the owner of a Powermate SX/20 wants...

    Just in case the owner of a Powermate SX/20 wants to try it, the SETUP.EXE for the SX/16 is at [here].
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    Now at http://minuszerodegrees.net/rom/rom.htm

    Now at http://minuszerodegrees.net/rom/rom.htm
  23. Thread: Toshiba T1900C

    by modem7
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    If the 19V power supply is unregulated (see [here...

    If the 19V power supply is unregulated (see [here]), it may be putting out significantly more than 19V.
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    Yes, try it without the XTIDE controller (or with...

    Yes, try it without the XTIDE controller (or with the card's ROM disabled).

    Some different options (one of which is Cassette BASIC) for performing SETUP are shown at [here].
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    No functional differences. IBM used different...

    No functional differences.
    IBM used different part suppliers (e.g. price competition, no single line of supply).


    - Verify, that like machine #1, the video cable from the CRT display unit is...
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