Appendix A

Glossary of Terms and

Abbreviations

Bus

A collection of unbroken signal lines across which information is

 

transmitted from one part of a computer system to another. Connections

 

to the bus are made using taps or connectors on the lines.

Bus Mastering

A high-performance way to transfer data. The host adapter controls the

 

transfer of data directly to and from system memory without bothering

 

the computer’s microprocessor. This is the fastest way for multitasking

 

operating systems to transfer data.

Byte

A unit of information consisting of eight bits.

Chain

In computers, the linking together of two or more SCSI devices so that

 

they are dependent upon one another for operation.

Daisy Chain

A set of SCSI devices connected in a series. When devices are

 

daisy-chained to a microcomputer, the first device is connected to the

 

computer, the second device is connected to the first, and so on down

 

the line.

Device Driver

A program that allows a microprocessor (through the operating system)

 

to direct the operation of a peripheral device.

External SCSI

A SCSI device installed outside the computer cabinet. These devices are

Device

connected in a continuous chain using specific types of shielded cables.

FCC

Federal Communications Commission.

File

A named collection of information stored on a disk.

Hard Disk

A disk made of metal and permanently sealed into a drive cartridge. A

 

hard disk can store very large amounts of information.

Host

The computer system in which a SCSI host adapter is installed. It uses

 

the SCSI host adapter to transfer information to and from devices

 

attached to the SCSI bus.

LSI20860 PCI to Ultra SCSI Host Adapter

A-1

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LSI 20860 manual Appendix a Glossary of Terms Abbreviations