from
The Free On-line Dictionary of Computing (8 July 2008)
Single In-line Memory Module
<storage> (SIMM) A small circuit board or substrate, typically
about 10cm x 2cm, with {RAM} {integrated circuits} or die on
one or both sides and a single row of pins along one long
edge. Several SIMMs are mounted with their substrates at
right-angles to the main circuit board (the {motherboard}).
This configuration allows greater packing density than direct
mounting of, e.g. DIL ({dual in-line}) RAM packages on the
motherboard. In 1993 one SIMM typically held one or four
megabytes, by early 1997 one could hold 8, 16, or 32 MB.
(1997-01-05)