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  1. Replies
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    Also, in case you are unaware, the 'VIDEO...

    Also, in case you are unaware, the 'VIDEO CONFIGURATION' table there is misleading.

    'None installed' = A video card that contains a BIOS expansion ROM (e.g. EGA) (e.g. VGA)
    'Color' = CGA...
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    No. You are supplying +5V via a header on the...

    No.

    You are supplying +5V via a header on the card. It sounds to me like you are using the wrong pin/s on that header.
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    Are you referring to J2 ? J2 is for a light pen.

    Are you referring to J2 ?
    J2 is for a light pen.
  4. And could it be that the particular BIOS is picky...

    And could it be that the particular BIOS is picky about when the key can be used.
  5. Most of my sources indicate only the delete key....

    Most of my sources indicate only the delete key. The one that differs indicates, "AMI BIOS - DEL, F1 or F2"
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    The document at the link at [here...

    The document at the link at [here] may contain more than what you saw/read.
  7. Thread: Televideo 912c

    by modem7
    Replies
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    153

    The 'Terminal Maintenance Training Manual' at the...

    The 'Terminal Maintenance Training Manual' at the web page pointed to by tingo is a collection of technical manuals.
    Section 5 covers the 912, comprising PDF pages 221 to 325.
    In it is also a...
  8. Thread: Televideo 912c

    by modem7
    Replies
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    153

    Welcome to these forums. Re-seated the...

    Welcome to these forums.

    Re-seated the connectors ?
    Re-seated the socketed chips ?
    Thorough visual inspection ?
    DC voltages out of power supply good ?

    I have a 912B, not the 912C. If the web...
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    I brought my IBM 5160 out of temporary storage....

    I brought my IBM 5160 out of temporary storage. It has a 64-256KB type motherboard, with an AST SixPackPlus to take total convenional memory to 640 KB.

    With only 256 KB total enabled, and with no...
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    Repeat of post at [here...

    Repeat of post at [here].
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    Related information at minuszerodegrees.net. See...

    Related information at minuszerodegrees.net. See [here].
  12. Done. The list is at [here...

    Done. The list is at [here].
  13. The IBM BIOS of an IBM 5162 motherboard does...

    The IBM BIOS of an IBM 5162 motherboard does output POST codes.

    I have yet to compile a list of those codes. I may do that today.
  14. Note that the motherboard BIOS' of the 5150 and...

    Note that the motherboard BIOS' of the 5150 and 5160 do not output POST codes.

    The modern POST card pictured at [here] seems to be popular.
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    Welcome to these forums. It seems unlikey to...

    Welcome to these forums.

    It seems unlikey to me that a manufacturer would produce a 16-bit ISA VGA card that does not work in an IBM AT.

    Be aware that the TH99 database that you pointed to, is...
  16. It is pretty straightforward. Plug the card in....

    It is pretty straightforward. Plug the card in. Plug displays POST codes.

    We have heard stories of people buying a CF-to-IDE adapter from China, to discover that it does not work, and subsequently...
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    Yes. See the 'Coexistence with MFM hard drive...

    Yes. See the 'Coexistence with MFM hard drive controller card' section of [here].
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    Some ProSpeed SX/20 support software at [here...

    Some ProSpeed SX/20 support software at [here].
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    Either: * You would need to find the schematic...

    Either:
    * You would need to find the schematic diagram for the card; or
    * You would need to get the owner to use a multimeter to discover if pins 3/4/5 of the 9-pin D connector are wired to an IC.
  20. Replies
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    The satisfaction of knowing that your great...

    The satisfaction of knowing that your great wealth of information is still delivering.
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    Regarding your, "why?": The maker of the 16-bit...

    Regarding your, "why?": The maker of the 16-bit motherboard could have used a single 16-bit ROM, but instead chose to use two 8-bit ROM's. Quite common. Even the IBM AT (IBM 5170) uses two 8-bit...
  22. An IBM 5150 example at [here...

    An IBM 5150 example at [here].
    An IBM 5160 example at [here].
    An IBM 5170 example at [here].
  23. Per [here...

    Per [here], the speaker beeping to indicate "Cannot initialize monitor" is a known behavior. That appears to be a bug in the diagnostic. It even happens on my fully 5170 functional motherboard....
  24. Some chips require two RAS signals, the first RAS...

    Some chips require two RAS signals, the first RAS for half of the addresses, and the second RAS for the second half of addresses.
    An example is at [here], where the chip comprises of two stacked...
  25. Welcome to these forums. When you do an...

    Welcome to these forums.

    When you do an in-circuit measurement of a capacitor that sits on a voltage rail, you are measuring not only the capacitor, but also all of the other components that sit...
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