Search suggests it's the mainboard from an Intel Professional/GX Workstation from 1993 - centre slot is for an EISA / ISA riser

http://cwcyrix.duckdns.org/intel-legacy ... tation%5d/

The last time I got a crappy picture like that was when the guy modified a stolen Ebay photo to scam me.
Be careful.

The seller is fine. I used them before. Free shipping/ free returns. No risk.

Thanks for the link. I had a Intel LP EISA station long time ago. I didn't know about the GX line..

The word document doesn't open correctly, but guessing from plaintext. It looks like the mystery chip might be Intel 82485-33 cache controller after all and the SIMM is actually a 128k SRAM cache module ( two-way set associative). Not bad but I was hoping for Weitek 4167 😀

I though the 82485 was a 386 thing...

mpe wrote on 2020-05-22, 19:08:

I though the 82485 was a 386 thing...

The 82385 was.

The mystery is solved. Got the board. The chip is indeed a 82485:

Which is controlling an unusual 64kB cache SIMM I haven't seen before. Given 2-way set configuration the performance should be equivalent to a bigger direct mapped cache.

Also there is another cache controller for 386dx is 395DX-xx where xx is frequency. Built in 16K and and zero wait state between CPU and FPU and the 395.

Also Pentium also has cache controller as well (mainly found on server boards).

Cheers,

Cool, never heard of the 395DX before. I'll have to check that one out. Can it work in 385 sockets?

The 82485 is a pretty obscure chip. By the time most people were buying 486s the cache controllers were already integral to the chipset, but I guess on the earlier designs the chipsets weren't mature yet.

I think I've seen the Pentium cache controller in the PS/2 model 90/95.