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Thread: 5160 (XT) running Supersoft Diagnostic

  1. #1

    Default 5160 (XT) running Supersoft Diagnostic

    Hello everyone,

    It has been a year since I have posted about the 5160 that is not booting properly.

    Last year I had tested the power levels that were good.

    Then members of this forum suggested that I get Supersoft Diagnostic burnt on a EPROM to replace U18 on the motherboard.

    That is what I just did: every test passes except the keyboard controller one.

    In the manual (thanks to minuszerodegrees.net) I have found that this test failing might be due to users directly touching the keyboard plug on the motherboard and causing some sort of discharge.

    I am getting back to you to know what should I consider doing next and what might be my options to bring this machine back to life.

    Without Supersoft, the fan is not running and the machine appears dead.

    With Supersoft, the fan runs, all tests run, I have something on the screen except the failing test: Keyboard Controller (Keyboard scanlines test passes).

    In the history of motherboard failures at the VCF, a malfunctioning keyboard controller appeared only once for a 5170, I hope my disease is curable.

    Thanks for any new advice you might suggest

    PS: I can now burn eproms for people who might need it (I am from France)

  2. #2
    Join Date
    Jun 2011
    Location
    Reunion Island (FR)
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    55

    Default

    Hello,

    Did you try another BIOS burned onto a new EPROM (from an XT clone or a genuine IBM BIOS)?
    You say that the PSU doesn't work with the original BIOS -> short circuit (if i'm right), perhaps the original BIOS chip is dead ?

  3. #3
    Join Date
    May 2006
    Location
    Melbourne, Australia
    Posts
    5,461

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    Quote Originally Posted by max5160 View Post
    Without Supersoft, the fan is not running and the machine appears dead.
    With Supersoft, the fan runs, all tests run, I have something on the screen except the failing test: Keyboard Controller (Keyboard scanlines test passes).
    The way I read that is:
    * Fan does not run when IBM BIOS chips are inserted in sockets U18/U19.
    * Fan runs when Supersoft chip is inserted in socket U18.

    If so, then I agree with Arkady. It suggests that one of the IBM BIOS chips (U18/U19) has gone faulty in a way that overloads the power supply. Or perhaps, the chips are not being inserted correctly.

    Quote Originally Posted by max5160 View Post
    In the history of motherboard failures at the VCF, a malfunctioning keyboard controller appeared only once for a 5170, I hope my disease is curable.
    In the 5170, the keyboard controller is a single chip. In the 5160, the keyboard interface circuitry is a set of chips.

    If the keyboard interface circuitry was faulty (as indicated by Supersoft), then I expect that use of good IBM BIOS chips would give you a display, but show a 301 error at power-on time.

    I think that for now, you should put aside the 'SuperSoft shows keyboard controller failure' symptom, and fix the symptom of 'power supply fan does not operate when IBM BIOS chips inserted'.

    I agree with Arkady. Have you burnt yourseft a replacement set (U18/U19) of IBM BIOS EPROMs ?

  4. #4
    Join Date
    May 2006
    Location
    Melbourne, Australia
    Posts
    5,461

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    Quote Originally Posted by max5160 View Post
    PS: I can now burn eproms for people who might need it (I am from France)
    I have added you to the list [here] at minuszerodegrees.net

  5. #5

    Default

    Hello,

    My test was Supersoft in U18 with the original IBM U19 left plugged in.

    I will get myself EPROMS that I will burn with the latest IBM images from 1986.

    My U18 is 62X0890 suggesting the latest revision.

    I will let you know, thanks again.

  6. #6

    Default 5160 boots!

    Ok two years later, I let you know. U18 was faulty.

    With a replacement U18 and original U19 the 5160 boots.

    I get a DOS prompt but with hard drive errors.

    In French:

    Données
    Erreur de lecture sur C
    Abandon, Reprise, Ignore, Continue?

    If I do a chkdsk c:, I get the same message:

    Données
    Erreur de lecture sur C
    Abandon, Reprise, Ignore, Continue?

    I can do a DIR, CD and run GWBASIC.

    It seems the hard drive can die anytime, I booted on Cassette Basic once (the hard drive does not seem to work all the time).

    I have heard of projects simulating a XT hard drive with Compact Flash.

    What do you think?

    Quote Originally Posted by max5160 View Post
    Hello,

    My test was Supersoft in U18 with the original IBM U19 left plugged in.

    I will get myself EPROMS that I will burn with the latest IBM images from 1986.

    My U18 is 62X0890 suggesting the latest revision.

    I will let you know, thanks again.

  7. #7
    Join Date
    May 2006
    Location
    Melbourne, Australia
    Posts
    5,461

    Default

    Quote Originally Posted by max5160
    Ok two years later, I let you know. U18 was faulty.
    With a replacement U18 and original U19 the 5160 boots.
    I have added that failure to the list at [here].

    Quote Originally Posted by max5160
    It seems the hard drive can die anytime, I booted on Cassette Basic once (the hard drive does not seem to work all the time).
    It may be worth while trying a low-level format, then partition, then high-level format.

    Quote Originally Posted by max5160
    I have heard of projects simulating a XT hard drive with Compact Flash.
    Three possibilities are listed at the bottom of [here]. They also apply to the IBM 5160.

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