SIMM (Single In-line Memory Module)
Manufacturer:	many	Speed:	60ns
Year Introduced:	1983	Frequency:
Burst Timing:		Pins:	30-72
Voltage:	3.3v-5.0v	Bandwidth:
As the first mass-produced Memory packages, these were 30 pin modules ~3.50" X 0.75", and were used primarily in 386, early 486, and Apple® computers. Designed as Fast-Page Mode non-Parity (2 or 8 chips per Single In-line Memory Module), or Parity (3 or 9 chips per Single In-line Memory Module), these were in 1Mb, 4Mb and 16Mb denominations. Installation must be in either 1 or 2 "banks" of either 2 or 4 matching SIMMs.      This design was soon replaced by 72 pin modules ~4.25" X 1.0", used primarily in later 486, 586 (Pentium®), and later Apple® models. Designed as Fast-Page Mode or EDO (explained later), these came as non-Parity or Parity with capacities of 4Mb, 8Mb, 16Mb, 32Mb, 64Mb and 128Mb. Most 486 and several Apple® machines only needed one Single In-line Memory Module per available socket, whereas Pentium® and PowerMacs® required matching pairs. Most machines required specific sizes and upgrade configurations.

Main Menu

BUG Computer Club Home Page


Last Update: 9:42 AM 11/18/02