Difference between revisions of "Small Computer System Interface"
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| − | ''' | + | 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 | + | 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]]). |
| − | {{stub}} | + | == 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 | ||
| + | |} | ||
| + | |||
| + | {{semi-stub}} | ||
| + | |||
| + | [[Category: Interface Standards]] | ||
Latest revision as of 16:18, 2 December 2023
The Small Computer System Interface (universally known by its acronym, SCSI) was a popular interface standard for high-speed devices (disks, tape drives, scanners, 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 pairs, 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
| 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 |
