Computer CPU Memory

Single Inline Memory Modules (SIMMs)

The single inline memory module or SIMM is still the most common memory module format in use in the PC world, largely due to the enormous installed base of PCs that use them (in new PCs, DIMMs are now overtaking SIMMs in popularity.) SIMMs are available in two flavors: 30 pin and 72 pin. 30-pin SIMMs are the older standard, and were popular on third and fourth generation motherboards. 72-pin SIMMs are used on fourth, fifth and sixth generation PCs.

The SIMM board is connected to a circuit control board by an edge connector. Single in-line memory modules represent a high density, low profile single in-line package for electronic components such as dynamic random access memory integrated circuit components. A plurality of these components can be mounted in line on a circuit panel whose height is little more than the length of the components themselves. With a SIMM, several memory devices such as DRAMs are mounted on a printed circuit board having an edge connector. The SIMM is designed to plug into a computer socket in electrical communication with address, data and power supply buses for the computer so that the randomly-addressable memory cells of the SIMM can be addressed directly by the computer’s CPU rather than by a bank-switching technique commonly used in larger memory expansion boards. One edge of a SIMM module is a card-edge connector, which plugs into a socket on the computer which is directly connected to the computer buses required for powering and addressing the memory on the SIMM.

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