Types and Characteristics of SCSI Adapters

SCSI adapters stand for a Small Computer System Interface. It is used to connect a microcomputer to several peripheral devices using just one port.

Devices connected in this way are said to be “daisy-chained” together, and each device must have a unique identifier or priority number.

Uses of SCSI Adapters

A SCSI adapter can be installed on an IBM-compatible computer as a single expansion board. SCSI is often used to connect hard disks, tape drives, CD-ROM drives, mass storage media, scanners, and printers.

Types and characteristics of SCSI Adapters

There are three different SCSI interface definitions: 

  1. SCSI-1
  2. SCSI-2
  3. and SCSI-3

SCSI – 1

The SCSI-1 is an 8-bit interface with a maximum data transfer rate of 5 MB per second.


the SCSI-2 is 16-bit or 32-bit wide (called wide SCSI).

Wide-fast SCSI has a 16-bit data bus and a maximum data transfer rate of 20 MB per second. SCSI-2 is backward compatible with SCSI-1.

Scsi adapters
Scsi adapters


The SCSI-3 definition increased the number of connected peripherals from 7 to 127, increased capable lent’s, and added support for a serial interface, and a fiber optic interface.

For SCSI-3 data rates in excess of 100 MB per second are possible.

Other Adapter

The other adapters used in microcomputers are

  • PCMCIA (personal computer Memory card interface Association) cards for notebook computers,
  • MPEG (Motion Picture Expert Group) cards for full-motion video playback,
  • Sound cards for audio applications,
  • Network adapters for networking applications,
  • Modern cards for telephone lines, etc.

Any of these cards can be plugged into the bus slot for a peripherals device.

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