Until at least February 1982, ANSI developed the specification as 'SASI' and 'Shugart Associates System Interface' however, the committee documenting the standard would not allow it to be named after a company. SASI is a fully compliant subset of SCSI-1 so that many, if not all, of the then-existing SASI controllers were SCSI-1 compatible.

SASI, which was used in mini- and early microcomputers, defined the interface as using a 50-pin flat ribbon connector which was adopted as the SCSI-1 connector. SASI controller boards were typically the size of a hard disk drive and were usually physically mounted to the drive's chassis. Ī SASI controller provided a bridge between a hard disk drive's low-level interface and a host computer, which needed to read blocks of data. Larry Boucher is considered to be the 'father' of SASI and ultimately SCSI due to his pioneering work first at Shugart Associates and then at Adaptec. SCSI is derived from 'SASI', the ' Shugart Associates System Interface', developed beginning 1979 and publicly disclosed in 1981. Further refinements have resulted in improvements in performance and support for ever-increasing data storage capacity. SCSI-2 was published in August 1990 as X3.T9.2/86-109, with further revisions in 1994 and subsequent adoption of a multitude of interfaces. The ancestral SCSI standard, X3.131-1986, generally referred to as SCSI-1, was published by the X3T9 technical committee of the American National Standards Institute (ANSI) in 1986. The initial Parallel SCSI was most commonly used for hard disk drives and tape drives, but it can connect a wide range of other devices, including scanners and CD drives, although not all controllers can handle all devices. The SCSI standard defines command sets for specific peripheral device types the presence of 'unknown' as one of these types means that in theory it can be used as an interface to almost any device, but the standard is highly pragmatic and addressed toward commercial requirements.

The SCSI standards define commands, protocols, electrical, optical and logical interfaces.

Small Computer System Interface ( SCSI, / ˈ s k ʌ z i/ SKUZ-ee) is a set of standards for physically connecting and transferring data between computers and peripheral devices.

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