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  1. Replies
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    However, the F300 version of the card is a...

    However, the F300 version of the card is a 'dynamic' type of controller (see [here]). With the F300, you inform the low-level formatting code of the geometry of the attached hard drive. Down the...
  2. Symptomatic of low battery voltage to motherboard...

    Symptomatic of low battery voltage to motherboard chip/s.

    CR2032 = 3 volts, then that will be reduced by the diode. Are you sure that is adequate for your motherboard ?
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    In a past IBM PC family support role, I have seen...

    In a past IBM PC family support role, I have seen 'weirdness' caused by users unintentionally overlapping RAM ([example]). No, I cannot further explain 'weirdness'; it was too long ago. The lesson...
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    If I categorise users of my website into...

    If I categorise users of my website into beginner, intermediate, and advanced, then I consider more than 640K of conventional memory to be an advanced subject, one that if documented, requires the...
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    The IBM 0665-30 (0665-030) will not need 'reduced...

    The IBM 0665-30 (0665-030) will not need 'reduced write current', and so set the starting cylinder for 'reduced write current' to 615. Set the starting cylinder for write pecompensation to 300...
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    Welcome to these forums. There is lots of IBM...

    Welcome to these forums.

    There is lots of IBM 5170 information at minuszerodegrees.net

    Based on the 5170 information at that website, to aid possible future discussion, what type (1,2, or 3) of...
  7. See...

    See http://minuszerodegrees.net/failure/failure%20-%203lt.htm
  8. 106 = 10 μf

    106 = 10 μf
  9. How does that help? From post #1, we already know...

    How does that help? From post #1, we already know that the card is a Graphics Solution SR.
  10. For example, for a scope of cylinders 0 to 5, and...

    For example, for a scope of cylinders 0 to 5, and head 0 only:

    When the low-level formatting code in the WDXT-GEN's ROM asks you for the formatting string, enter 6 for the cylinder count, and 1...
  11. Reference: User's guide for the WDXT-GEN For...

    Reference: User's guide for the WDXT-GEN

    For the ST-225, the third figure, starting cylinder for reduced write current, is unimportant, because reduced write current is not applicable to the...
  12. A WDXT-GEN specific cabling diagram is at [here...

    A WDXT-GEN specific cabling diagram is at [here].
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    In regard to fitting hard drives into an IBM...

    In regard to fitting hard drives into an IBM 5150, in case you are not already aware, be aware of the information at [here].
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    Welcome to these forums. The large '2' on your...

    Welcome to these forums.

    The large '2' on your 0665-30's defect sticker indicates that if the drive were to be fitted into an IBM AT, that drive type 2 is what would be set in the IBM AT's SETUP...
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    I should have confirmed earlier: Because the...

    I should have confirmed earlier: Because the Supersoft/Landmark diagnostics send beeps to the speaker, did you have a speaker plugged in?


    Assuming that your POST card is a model that will not...
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    A match appears to be the motherboard at [here...

    A match appears to be the motherboard at [here].
  17. Thread: Hi from Blighty

    by modem7
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    Motorcycles and CPU cycles.

    Motorcycles and CPU cycles.
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    After a much thorough search, I located both my...

    After a much thorough search, I located both my 'vintage' and 'modern' POST cards (the ones pictured at [here]).

    The 'display 3B on POST card' code works for my 'vintage' POST card, on both...
  19. Maybe only 6 are used. For example, on the IBM...

    Maybe only 6 are used.

    For example, on the IBM 5150 motherboard, only 5 of the 8 switches in the second switch block (SW2) are wired for use. And of those 5, the first and second revisions of...
  20. When I read your post, I get the impression that...

    When I read your post, I get the impression that you believe that there is only one type of 'ATI Graphics Solution' card.
    According to [here], there are various types.
    Did the manual that you found...
  21. From the Internet: Seagate ST-251-1 = 820...

    From the Internet: Seagate ST-251-1 = 820 cylinders / 6 heads / 17 sectors per track

    At [here], a web page that covers the subject matter, there is no exact match for 820/6/17. You (or a previous...
  22. Maybe each of your four faulty floppy drives has...

    Maybe each of your four faulty floppy drives has a short circuit in it, overloading the power supply. Four is a lot!

    Your "IBM PC 5150" and "4 IBM full height disk drives" suggests to me that the...
  23. Maybe you should open up the computer and do an...

    Maybe you should open up the computer and do an inspection. You may find that the RTC battery has leaked, causing problems nearby ([example]). And it provides the opportunity to re-seat the keyboard...
  24. Good work. I have added a pointer to your work...

    Good work.

    I have added a pointer to your work to the RTC software collection at http://minuszerodegrees.net/rtc/rtc.htm
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    Is Digikey part CP-2350-ND suitable? See [here...

    Is Digikey part CP-2350-ND suitable? See [here], in particular, the datasheet there.
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