Small Computers System Interface (SCSI) Seminar

Small Computers System Interface (SCSI) Seminar: SCSI is a kind of interface which is used for computer components like hard drives, optical drives, scanners and tape drives. The Small Computers System Interface (SCSI) was originally developed by IBM.

There are three components mentioned in any SCSI system. They are Controller, Device, and Cable.

The heart of SCSI is the controller. It acts as an interface between all devices on SCSI bus and the computer. It is also called host adapter. It can be a card which is plugged into a slot. It can be built exactly into the motherboard. There is a SCSI BIOS on the controller. This is a small ROM or Flash memory chip that has the software needed to access and control the devices on the SCSI bus.

Every device on the SCSI bus has a built-in SCSI adapter which allows it to interface and communicate with SCSI bus. Embedded SCSI devices are those devices on which adapter are built. Each SCSI device must have a unique identifier (ID). Depending on specification, an SCSI bus has ability to support 8 or 16 devices. Using a resistor circuit, each end of the SCSI bus is closed which is called Termination. There are only two terminators which are used one for each end of the SCSI bus.

There are three jumpers which are used to describe the SCSI ID. This interface is not a happy participant in multiple host scenarios. It has been spindled, folded, and mutilated to the point and grudgingly allows two hosts to talk to a given device string.


SCSI has a high speed communication bus. It allows connectivity both from inside and outside the computer. The SCSI is of three types. They are SCSI-1, SCSI-2, and SCSI-3. Termination of SCSI interface can be done either in active or passive mode. SCSI is smarter bus than IDE.

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