View source for Small Computer System Interface

The '''Small Computer System Interface''' (universally known by its acronym, '''SCSI''') was a popular [[interface]] [[standard]] for high-speed devices ([[disk]]s, [[magnetic tape drive|tape drives]], [[scanner]]s, etc). It was composed of a set of standards for the various layers: physical signalling, commands, etc.

Over time, a variety of options were developed for many of these; e.g. the original standard was 8-[[bit]] [[parallel]] using [[single-ended signalling]], but later versions used 16-bit with [[differential pair]]s, at a variety of speeds (mostly [[synchronous]], but one was [[asynchronous]]). Even later, a high-speed [[serial]] version was developed; and ultimately, one which worked over [[TCP/IP]] (usually over an [[Ethernet]]).

== SCSI Versions ==

{| class="wikitable" style="margin:auto"
|+ Some common SCSI Versions
|-
! Name !! Alternative Name !! max. Devices !! Bus Bandwidth MB/sec 
|-
| SCSI || SCSI-1 || 8 || 5
|-
| Fast(-Narrow) SCSI || (Narrow) SCSI-2 || 8 || 10
|-
| Fast-Wide SCSI || (Wide) SCSI-2 || 16 || 20
|-
| Ultra(-Wide) SCSI || (Wide) SCSI-3 || 16 || 40
|}

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[[Category: Interface Standards]]