Are you sure is this graphics card 😀

Serial port and vga port looks similar

It has a VGA connector and it works, so I am sure 😀

Isn't it this one?

https://vgamuseum.info/index.php/cpu/item/39- … -promotion-3210

That chip (or a close relative) was used on VLB graphics cards too.

Its probably an ancestor of the 2D chip used in the 3DFX Voodoo Rush (yes the one everybody hates).

rain wrote on 2023-12-16, 13:45:

Are you sure is this graphics card 😀

To be fair, it does say "VGA MMUI 3600" on the PCB, so one can assume...

rain wrote on 2023-12-16, 13:59:

Serial port and vga port looks similar

Ports might look similar. But this card has 1MB of memory and two sockets for 1MB memory upgrade, DAC chip, BIOS chip and a main Alliance ProMotion 3210 video chip.

I probably have one of these VGA cards.

Meatball wrote on 2023-12-16, 14:17:

Isn't it this one?

https://vgamuseum.info/index.php/cpu/item/39- … -promotion-3210

Very similar but slightly different topology ~ maybe there's some other identifiers back of board.

Pretty clear that the card was based on Alliance Semiconductor ProMotion 3210, build by a third party:

The card maker might or might not be listed; I could only ascertain that it was not by miro or Orchid.

Based on my experience with 6410, it should be craptastic chip.

Whenever I see a graphics card with the RAMDAC placed on the wrong end of the PCB, I just assume it must be substandard.
Why are so many cheapo cards designed like this? It doesn't appear that PCB real estate was lacking.

Anonymous Coward wrote on 2023-12-20, 02:46:

Whenever I see a graphics card with the RAMDAC placed on the wrong end of the PCB, I just assume it must be substandard.
Why are so many cheapo cards designed like this? It doesn't appear that PCB real estate was lacking.

Maybe Alliance screwed up the pinout? That thing is upside down.

It looks like it is meant for a VLB card, trying to get the RAMDAC to left side will mean a whole bunch of traces have to cross each other, possibly making things unroutable...

Like the chips say, it is an Alliance ProMotion 3210 graphics chip with an AT&T PrecisionDAC RAMDAC.

As to who might have manufactured it, if you know that the card should have the original BIOS intact, you can try running the SNOOP tool on it to see if there are any VESA strings or BIOS strings that might identify the manufacturer.

Running the SNOOP command with parameter

SNOOP strings

will find human-readable strings from the graphics card BIOS.

I have two Alliance ProMotion graphics cards:

MiroVideo 12PD v1.02 Alliance Semiconductor ProMotion 3210, RAMDAC AT&T PrecisionDAC ATT20C408-13 9510S 43505742
MiroVideo 12PD v2.00 Alliance Semiconductor ProMotion 6410, RAMDAC AT&T PrecisionDAC ATT20C408-13 9519S 25063742

Both are a bit wonky with CRT Terminator, and they do some naughty things with the Feature Connector and VGA palette, although unsure if those quirks are due to MiroVideo, or due to Alliance Semiconductor, or the RAMDAC.