What is a SIMM?
A SIMM is a Single In-line Memory Module.
A SIMM is a small circuit board designed to hold a set of RAM chips.
Two types of SIMM's have been in general use. 30-pin SIMM's and 72-pin SIMM's.
30-bit SIMM's have 8-bit data buses; 72-pin SIMM's have 32-bit data buses.
The pinouts for all SIMMs is not completely standard. Some manufacturers, such as HP, Compaq, and IBM used non-standard pinouts in their proprietary SIMMs. If you are upgrading SIMMs, be sure to use compatible SIMMs.
SIMM's have largely been replaced with DIMM's.
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