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    Welcome to these forums. Some people here...

    Welcome to these forums.

    Some people here discovered that the lubrication on the rails for the head carriage (see [here]) had deteriorated to the point where improper head stepping was occurring.
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    Per [here...

    Per [here].
  3. See section 4.17 of the maintenance manual at...

    See section 4.17 of the maintenance manual at [here].
  4. See [here...

    See [here] also.
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    Photos of the extender and receiver cards used...

    Photos of the extender and receiver cards used with the IBM 5161 are at [here].
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    Good work. Looking at the circuit diagram and...

    Good work.

    Looking at the circuit diagram and POST source code, I suspect that the failure mode of the bank-0 bit-0 chip was: the RAM chip was always outputting its data (i.e. including times when...
  7. I wonder if the computer's motherboard has an RTC...

    I wonder if the computer's motherboard has an RTC module that contains a nearly depleted battery/cell. We have sometimes seen odd boot/SETUP behaviour caused by that. Example at [here].
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    Long standing advice has been to never smoke...

    Long standing advice has been to never smoke whilst using your computer. :-)
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    How is power supplied to the drive ? Note that...

    How is power supplied to the drive ?

    Note that the stock floppy controller in an IBM 5150 does not supply drive power on its external 37-pin connector.
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    Welcome to these forums. A pity. A 'known...

    Welcome to these forums.


    A pity. A 'known working' video card would have allowed you to very quickly isolate the problem to either 'microcontroller' or 5151.


    Yes, I am finding it hard to...
  11. Thread: IBM 5170 issue

    by modem7
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    The D82284 has dual functionality, described by...

    The D82284 has dual functionality, described by Intel as a 'clock generator and ready interface'.
    Per [here], in the IBM 5170, for 12/16 MHz clock generation, the D82284 requires the connected...
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    That sounds like the one described in the...

    That sounds like the one described in the construction manual at [here]. Circuit diagram and description included. When published, I built some from kits, and still have at least one.
  13. Thread: IBM 5170 issue

    by modem7
    Replies
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    I have added the IBM 5170's startup sequence to...

    I have added the IBM 5170's startup sequence to [here]. I will enhance that later.

    We know that the OP is not seeing any codes on a POST card (OP sees "--"), and so we know that step 10 is not...
  14. No. One reason is that the controller, the 'IBM...

    No. One reason is that the controller, the 'IBM 5.25 diskette drive adapter', does not support a 300 Kbits/second data rate, the rate used when a 360K floppy is operated in a 1.2M drive. Some more...
  15. Thread: IBM 5170 issue

    by modem7
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    736

    The OP has a POST card. Previous experience...

    The OP has a POST card. Previous experience reveals that if the only problem is a completely faulty MC146818 (or it being ineffective, for whatever reason), a POST card will stop at code 02 if the...
  16. Thread: IBM 5170 issue

    by modem7
    Replies
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    736

    Careful with "continuity". For example, if I use...

    Careful with "continuity". For example, if I use the 'continuity' setting of my multimeter to measure a good 56 ohm resistor from my spares box, my multimeter will beep. That is because the...
  17. Thread: IBM 5170 issue

    by modem7
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    736

    So, when you earlier wrote, "NEW PSU is...

    So, when you earlier wrote, "NEW PSU is outputting proper voltages", the motherboard was not connected to the PSU. (Otherwise the motherboard would have overloaded the PSU, resulting in the PSU...
  18. Thread: IBM 5170 issue

    by modem7
    Replies
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    736

    Which means that there is no short circuited...

    Which means that there is no short circuited capacitor. If there was, it would overload the new PSU, resulting in the new PSU shutting down.

    To start, a functional IBM 5170 motherboard will only...
  19. All I can do is provide a possible workaround...

    All I can do is provide a possible workaround (not fix) - see [here].
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    To give you some kind of idea, for the IBM PC...

    To give you some kind of idea, for the IBM PC family, I have recorded some motherboard BIOS ROM failures at [here].
    That page excludes Cassette BASIC ROM failures and BIOS expansion ROM failures....
  21. In case you are unaware, a copy of the...

    In case you are unaware, a copy of the maintenance manual is at [here].
  22. I see now that I have taken a closer look at the...

    I see now that I have taken a closer look at the photos in the first post.

    Oki MSM37S64 used on the parent board; Oki MSM3764 (no "S") used on the piggyback board.

    The MSM37S64 is listed at...
  23. I see 64 KB (one bank of 64Kbit chips).

    I see 64 KB (one bank of 64Kbit chips).
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    Do you have any references (books, magazine...

    Do you have any references (books, magazine articles, etc.) to support that single reason for a year and a half delay ?

    Surely, a part of that delay is IBM (IBM USA) thinking something like, "We...
  25. The Award BIOS. What exactly is the error...

    The Award BIOS.


    What exactly is the error message ?


    All that you should need to do is set the hard drive type number in 'CMOS SETUP' to type 0.
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