SCSI (Small Computer System Interface) Interface

SCSI is a parallel interface standard for attaching peripheral devices to a PC. SCSI provides transfer rates up to 80 MB per second and depending on the standard the SCSI bus can contain up to 15 devices. Due to the lack of a single SCSI standard, some devices may not work with some SCSI boards.

The following are types of SCSI in use today:

• SCSI-1

  Uses 8-bit bus, supports data rates up to 4 MB per second and uses a 25-pin connector.



• SCSI-2

  Uses a 50-pin connector instead of a 25-pin connector and supports multiple devices. Most common SCSI type.



• Wide SCSI

  Uses a wide cable to support 16-bit transfers.



• Fast SCSI

  Doubles the clock rate to support data rates up to 10 MB per second.



• Fast Wide SCSI

  Uses 16-bit bus and supports data rates up to 20 MB per second.



• Ultra SCSI

  Uses 8-bit bus and supports data rates up to 20 MB per second.



• SCSI-3 (Ultra Wide SCSI)

  Uses 16-bit bus and supports data rates up to 40 MB per second.



• Ultra2 SCSI

  Uses 8-bit bus and supports data rates up to 40 MB per second.



• Wide Ultra2 SCSI

  Uses 16-bit bus and supports data rates up to 80 MB per second.

SCSI Cables