Single Inline Memory Module

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Two 30pin SIMMs

A Single Inline Memory Module (usually abbreviated to SIMM) was a standard main memory technology in the early Pentium era.

These memory chips came on a small printed circuit board that you would snap in place into a socket. These were far easier to install, remove and upgrade than the old DIP chips.

SIMMs were typically known for how many pins they had, with the common types being 30 pin & 72pin SIMMs.