Shepardson Microsystems

Shepardson Microsystems, Inc. (SMI) was a small company producing operating systems and programming languages for CP/M, the Atari 8-bit family and Apple II computers. SMI is most noted for the original Apple II disk operating system, Atari BASIC, and Atari's disk operating system. Shepardson Microsystems was founded by Robert Shepardson in Saratoga Springs, New York.

Shepardson Microsystems, Inc.
Company typePublic
IndustryMicrocomputer Software
FounderRobert Shepardson
Defunct1981 (1981)
SuccessorOptimized Systems Software
Headquarters,
United States
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