IBM PS/2 Model 55 SX

< IBM PS
Personal System/2 Model 55 SX
A PS/2 Model 55 SX
DeveloperInternational Business Machines Corporation (IBM)
ManufacturerIBM
Product familyPersonal System/2
TypePersonal computer
Release date
  • May 9, 1989 (1989-05-09) (Model 55 SX)
  • October 9, 1990 (Model 55 SL)
Lifespan1989–1992
DiscontinuedMay 1992 (1992-05)
Units soldOver 1 million
Media
  • 1.44 MB 3.5-in floppy disks (Model 55 SX)
  • None (Model 55 SL)
CPUIntel 386SX at 16 MHz
Storage
  • 30–80 MB hard drive (Model 55 SX)
  • None (Model 55 SL)
GraphicsVideo Graphics Array
Power120/240 VAC ～
RelatedList of IBM PS/2 models

The Personal System/2 Model 55 SX is a midrange desktop computer in IBM's Personal System/2 (PS/2) family of personal computers. First released in May 1989, the Model 55 SX features an Intel 386SX processor running at a clock speed of 16 MHz. In October 1990, IBM introduced a diskless workstation version of the Model 55 SX, called the Personal System/2 Model 55 LS. The Model 55 SX was the best-ever selling computer in the PS/2 range, accounting for 23 percent of IBM's PC sales within four months of its introduction. By 1991, the PS/2 Model 55 SX was the best-selling x86-based PC in the world.

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