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SCSI - Small Computer Systems Interface
Over the years, this IBM bus, which became known as the OEM Channel, was modified, enhanced, and presented to the American National Standards Institute (ANSI) for adoption as a standard I/O bus for peripheral devices. Because of the proprietary nature of the OEM Channel, the ANSI committee rejected it, citing the need for a commercially standard parallel I/O bus.
In the early 1980's, Adaptec's founders, while at disk drive manufacturer Shugart Associates, developed a parallel I/O interface called SASI for Shugart Associated System Interface. When this specification was finalized, it was released to several different manufacturers and enjoyed commercial success. In 1982, SASI was presented to ANSI as a basis for standard. Because of the commercial success and widespread market use of SASI, ANSI formalized and extended the SASI specification and changed the name to SCSI (in part to separate the specification from any one vendor in particular). In June 1986, SCSI was formally adopted by ANSI.
What is SCSI?
Something about Mac:
Ultra2 SCSI (LVD/SE):