It is labeled PMEB-1000 Rev 1, has 8 30 pin SIMM slots and connections for PS/2 mouse, game, and 2 serial ports but the controller chips are not on this board (just 4 MC74F245N chips which are Octal Bidirectional Transceivers).
this looks like somebody's proprietary memory and I/O expansion. the back side of the board isn't visible, the front has no gold fingers on the ISA card edge, so it's safe to conclude that it won't work with anything other than the specific motherboard it was designed for.
The back side of the ISA card edge does have 5 pins (1,3,10,29,31) which are either ground or 5VDC. I just find it cool, and it probably got mixed in a stack of VLB cards (which look similar) I snagged ages ago.
Maybe a tip: not everybody pays attention to all threads. What about publishing the picture in the "386/486 based systems" thread? I have the feeling that card could belong to a 386 machine that had an Intel/Compaq (?) ISA extension that predated EISA, VLB and PCI.
Well the picture side is definitely 8 bit ISA, the left part, the way bus is connected to those 8bit T/Rs is bog standard.
If backside is +5V and grounds, this is 8 bit ISA memory and I/O controller. For some funky system that has some funky proprietary slots.
Best you can do is connect that card to 8 bit ISA somehow and test it.
Those jumpers down there jump between ISA and E...? EICA? Possibly the name of the socket standard you're looking for.