There are 4 short slots for SIMM memory.
This board has two long slots for a new kind of memory called DIMM DRAM.
This board can handle a maximum of 256 MB of memory.

From the manufacturer's description:

Two 168 pin DIMM DRAM slots (8/16/32/64 MB module)

Four 72 pin SIMM memory slots (4/8/16/32/64 MB module)

Supports maximum 256 MB with Fast Page/EDO/SDRAM DRAM

That's pretty scary stuff. Just keep such information handy for when someone who understands these things asks you about them.