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  1. Replies
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    In the manual that dkedrowitsch pointed to, the...

    In the manual that dkedrowitsch pointed to, the front page is titled 'UX Turbo (44256 VERSION)'. 44256 is the main type of RAM chip on my motherboard. Because your board uses 414256 RAM instead,...
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    I have updated that entry to reflect the...

    I have updated that entry to reflect the information learned in this thread.
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    At [here...

    At [here] is a lot of Displaywriter documentation.

    One of the documents there is named S241-6248-3_Displaywriter_Product_Support_Manual_Feb83.pdf, and its chapter 9 covers diagnostics.
    Have you...
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    "echo ^G" alone is enough. Not sure why I added...

    "echo ^G" alone is enough.
    Not sure why I added the redirection to the console.
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    Of course, the symptoms may be totally unrelated....

    Of course, the symptoms may be totally unrelated.


    Nil video symptom

    Could even be the monitor. Try another monitor.

    Does the symptom appear using a different video card.

    Symptom onset...
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    Thanks to Chuck, EzTape version 1.13 is now...

    Thanks to Chuck, EzTape version 1.13 is now hosted at [here] (under 'Irwin').
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    Welcome to these forums. There is an IBM 5150...

    Welcome to these forums.

    There is an IBM 5150 specific list of known-compatible VGA cards at [here]. Both 8-bit and 16-bit.
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    Leaking battery damage

    On my list-of-things-to-do, was an item to repair a faulty IBM 5150 motherboard, one that I had acquired years ago. Prior to acquisition, the motherboard had had a card fitted where the on-card...
  9. Thread: IBM 5170 Issue

    by modem7
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    That is C83, a 27pF ceramic cap used as part of...

    That is C83, a 27pF ceramic cap used as part of the oscillator circuit for the RTC chip. On an IBM 5170 board that I am looking at right now, its C83 is also marked "K2J" on the rear.

    Assuming a...
  10. The Orchid TinyTurbo 286 is different to the...

    The Orchid TinyTurbo 286 is different to the subject accelerator card.
  11. Additional information at [here...

    Additional information at [here].
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    See the thread at [here...

    See the thread at [here].
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    Suggesting that you have 6 MB fitted to the 'IBM...

    Suggesting that you have 6 MB fitted to the 'IBM Memory Expansion Adapter' card: 512K on motherboard, plus 6144K on the card = 6656K


    What could be happening is that the card is configured to...
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    1. Goto minuszerodegrees.net 2. Navigate to the...

    1. Goto minuszerodegrees.net
    2. Navigate to the [IBM 5170] section.
    3. Select [Some IBM Expansion Cards and Options].
    4. See the [IBM Memory Expansion Adapter (MEA)] and [IBM Enhanced Memory...
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    There are some clone XT motherboards where...

    There are some clone XT motherboards where 'turbo' mode needs to be off for reliable floppy operation.
  16. What happens if you revert what you did, i.e....

    What happens if you revert what you did, i.e. remove the battery ? Simple to do.
  17. Member Robin4 was the one who provided the ROM...

    Member Robin4 was the one who provided the ROM image for the -0 web site, which suggests that he has one of the subject cards. Perhaps send him a PM.
  18. Additional bypass/filter caps. On the IBM CGA...

    Additional bypass/filter caps.
    On the IBM CGA card, if one is short circuit, the power supply will not start due to being overloaded.
    On the IBM CGA card, if one is open circuit, a 'no video'...
  19. I am unfamiliar with Leading Technology machines....

    I am unfamiliar with Leading Technology machines.

    According to what I can see, some keyboard methods of getting into different Phoenix BIOS' are:

    F1
    F2
    Ctrl-Alt-Esc
    Ctrl-Alt-S
    Ctrl-S...
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    Welcome to these forums. It sounds like the...

    Welcome to these forums.

    It sounds like the symptom trigger is temperature.

    I think it more likely that the cause is in the 5151. On that basis, try adjusting the 5151's V-HOLD control to a...
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    Note that IBM are known to have periodically...

    Note that IBM are known to have periodically changed the contents of the PSU.
    Therefore, any list that a member provides may not correspond to the particular PSU in your 5150.
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    It turns out that this 1981/1982 difference has...

    It turns out that this 1981/1982 difference has already been recorded in these forums; post #20 at [here].
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    Consider too the use of Ruud's diagnostic ROM....

    Consider too the use of Ruud's diagnostic ROM. See [here].

    The kind of output expected from that for failed RAM bits is shown at [here].
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    Expect a screen similar to that shown at [here...

    Expect a screen similar to that shown at [here]. That screen was produced when I simulated a failure of bit 2 in bank 0. Note the row in the bottom-right labeled "FAILING BITS" and how in that row,...
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    See the 'Setups' section of [here...

    See the 'Setups' section of [here].
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