LSI 20860 manual Appendix a Glossary of Terms Abbreviations

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