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Thread: WTB: 8 Bit ISA VGA Card for IBM 5150 Motherboard

  1. #1
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    Default WTB: 8 Bit ISA VGA Card for IBM 5150 Motherboard

    WTB: 8 Bit ISA VGA Card that will defiantly work in an IBM 5150 Motherboard.

    If you can please post a picture of what you have for sale. Thanks

  2. #2
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    Per [here], some 16-bit VGA cards are known to work with the 5150 motherboard.
    Are you specifically after 8-bit cards, or are 16-bit cards acceptable too ?

  3. #3

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    Your chances are raising massively if you replace the 8088 by a NEC V20. The issue is not so much the motherboard but the VGA BIOS of many 8-bit capable cards using 286 instructions.

  4. #4
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    Quote Originally Posted by modem7 View Post
    Per [here], some 16-bit VGA cards are known to work with the 5150 motherboard.
    Are you specifically after 8-bit cards, or are 16-bit cards acceptable too ?
    Well I guess I just need one that will work for a reasonable price.

    I've got a 5150 Motherboard that I'd like to sell, but it hasn't been Tested and I don't have any Video Cards that I can use to perform the Test.

    I don't feel right putting it up for sale without knowing that it actually works.

  5. #5

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    Any Trident TVGA8900C based VGA card will work in a 5150. Though designed as a 16 bit ISA card, they will autodetect when installed in an 8 bit slot. The generic board layout and jumper settings for this card can be found at https://stason.org/TULARC/pc/graphic...VGA-8900C.html

    These cards are plentiful on eBay, and relatively inexpensive.

  6. #6
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    Of course, you need a later BIOS that recognizes extension ROMs. The first 5150 BIOS ROMs didn't have that ability.

  7. #7
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    Quote Originally Posted by hmb View Post
    Any Trident TVGA8900C based VGA card will work in a 5150.
    How do you know that?
    For example, for all we know, some Taiwanese company designed/produced a TVGA8900C based VGA card, targeted it for 16-bit machines only, and put 80286 instructions in the card's BIOS.

  8. #8

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    Quote Originally Posted by modem7 View Post
    How do you know that?
    For example, for all we know, some Taiwanese company designed/produced a TVGA8900C based VGA card, targeted it for 16-bit machines only, and put 80286 instructions in the card's BIOS.
    Fair enough - I cannot say for certain that hasn't happened. I recently went through the process of finding a VGA card for my 5150, and ended up with two cards that both worked. One was the TVGA8900C based card (which I will describe in more detail). The other was an ATI VGA Wonder-16 which despite its name works perfectly in a 5150 as long as it has a BIOS ROM version of 3 or earlier - unfortunately ATI's early "VGA Wonder" cards are both harder to find and more expensive that the more common early-model Trident cards.

    The TVGA8900C card that I know works with a 5150 (with a later BIOS, as pointed out above by Chuck) is a fairly common configuration that has the identifier "8916CX2/4/8 LC2 REV A", has two Quadtel BIOS ROMS (version C2.11), and has the jumper layout shown at https://stason.org/TULARC/pc/graphic...VGA-8900C.html .
    There is a very similar version of this card with a single Quadtel BIOS ROM (version 3). It retains the same jumper layout (including the 8/16 bit bus detect jumper) of the card I mentioned above. However, I have not personally tested this version of the card on a 5150.
    Pictures of both versions are shown at http://old.vgamuseum.info/home/214-t...vga-8900c.html
    Usually there are several of both versions listed on eBay at point in time.

    According to its manual the Trident TVGA 8900D apparently works in a PC or XT (no personal experience). The 8900D card has two sets of jumpers: one for 8/16 bit bus selection, the other for 8/16 bit BIOS detection.
    Last edited by hmb; August 29th, 2020 at 04:02 PM.

  9. #9
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    I have a Hercules 8_bit VGA card.

    Photo to follow.

  10. #10
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