Small Computer System Interface: Difference between revisions
From Computer History Wiki
Jump to navigationJump to search
m Redo to file under full name |
m +Category |
||
| (3 intermediate revisions by 2 users not shown) | |||
| Line 2: | Line 2: | ||
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]]). | 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 | |||
|} | |||
{{semi-stub}} | {{semi-stub}} | ||
[[Category: | [[Category: Interface Standards]] | ||
[[Category: SCSI]] | |||
Latest revision as of 13:41, 21 September 2025
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 |
