Editing SIMM (section)

{{Short description|Computer memory module}}
{{about|a type of memory module for computers}}

<!-- Commented out because image was deleted: [[Image:SIMMs.jpg|frame|30- (top) and 72-pin (bottom) SIMMs. Early 30-pin modules commonly had either 256 KB or 1 MB of memory.]] -->
[[File:SIMM 30 68 72.png|thumbnail|30-pin, proprietary Apple 68-pin, and 72-pin SIMMs]]

A '''SIMM''' ('''single in-line memory module''') is a type of [[memory module]] used in computers from the early 1980s to the early 2000s. It is a printed circuit board upon which multiple [[random-access memory]] [[Integrated circuit]] chips are attached to one or both sides.<ref name="GeeksforGeeks 2020 e240">{{cite web | title=What is DIMM(Dual Inline Memory Module)? | website=GeeksforGeeks | date=2020-04-15 | url=https://www.geeksforgeeks.org/what-is-dimmdual-inline-memory-module/ | access-date=2024-04-07 | quote=In the case of SIMM, the connectors are only present on the single side of the module...DIMM has a row of connectors on both sides(front and back) of the module}}</ref> It differs from a [[dual in-line memory module]] (DIMM), the most predominant form of memory module since the late 1990s, in that the contacts on a SIMM are [[redundancy (engineering)|redundant]] on both sides of the module. SIMMs were standardised under the [[JEDEC]] JESD-21C standard.

Most early PC [[motherboard]]s ([[Intel 8088|8088]]-based PCs, [[IBM Personal Computer XT|XT]]s, and early [[IBM Personal Computer AT|ATs]]) used socketed [[Dual in-line package|DIP]] chips for [[DRAM]]. As computer memory capacities grew, memory modules were used to save motherboard space and ease memory expansion. Instead of plugging in eight or nine single DIP chips, only one additional memory module was needed to increase the memory of the computer.