Looks like an AST memory card that fit in a special slot, there are other boards from other manufactures that also used that style memory add-on card on some early 286/386 based systems. No idea which system it originally came from.

Thanks for the lead. I will look into it. 😀 I was thinking it had to some from some prebuilt type system, just didn't know where to start.

Not helpful to your ID, but in post #4 here there's an example of one for the Asus ISA-486C motherboard. They were typically proprietary:

ASUS 386/33-64K - cache upgrade?

I'd love one for my equivalent 386 mobo, but I doubt I'll ever find one.

Awesome. Thank you for the example.

After looking at it more closely it appears to be for an XT class machine. The 9 chip banks are typical when 41256 dips are used, where a 286 would have 18 of them. It also appears the front larger slot handles the data and the smaller back part handles addressing. Have only found one other card with similar "off set 16 bit ISA style" connector but it has SIMM sockets so not much of a lead....

It's possible it could have came from an old industrial PC as well. It came in a random scrap lot, but the lot had other XT and 486 class hardware in it (EGA card, CGA card, IDE cache card, MFM controller, Mach64 VLB, Cirrus Logic VLB, and a RLL EDSI controller)