Can't immediately ID the card, and the DRAM chip codes aren't legible in the pics, but I'd say it's very likely it already has 2MB onboard and sockets for 4x 512kB, so it should be able to do 4MB, and the 864 certainly supports it. If it works, it would be one of the best VLB cards out there, both for DOS gaming and for Windows hi-res stuff (1024x768@24b)/

Edit: nope, another "supports the RAM but doesn't use it" chip.

It's Digital DEC S3 864 with 2MB on board and upgreadable to 4MB on VLB. I have it and one seller also from here was (or is) selling one for a long time described as 1MB. As far as I could test it, there is no benefit of having 4MB at all... no higher resolutions/color depth, nothing... like it still had only 2MB. Since I had two it's not very probable that both were somehow defective.

I stand corrected. Looked up the datasheet and it's disappointing:
http://old.vgamuseum.info/images/stories/doc/ … n864_manual.pdf

Page 1-1 section 1.3

Video Resolutions Supported for 4MB indeed exactly the same as 2MB. I've tried reading through rest of document for any other benefit, but didn't see any...

What are these connectors for ?

Intel486dx33 wrote on 2020-10-28, 15:31:

What are these connectors for ?

Looks like a daughter card connector for AV / video frame capture (but I could be wrong)

Info world has reference to an MPEG daughtercard (which is probably rarer than PGA)

Wonder if it’s similar

VGA VLB S3 Digital Equipment Corporation (DEC) 86C801/805, basic info

https://pdos.csail.mit.edu/6.828/2012/reading … e/vgadoc/S3.TXT