LSI Symbios SYM22801, User Manual

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Glossary of Terms and Abbreviations B-1
Appendix B
Glossary of Terms and
Abbreviations
Address A specific location in memory, designated either numerically or by a
symbolic name.
Asynchronous
Data Transfer A method of transmission which does not require a common clock, but
separates fields of data by stop and start bits. It is slower than
synchronous data transfer.
BIOS Basic Input/Output System. Software that provides basic read/write
capability. Usually kept as firmware (ROM based). The system BIOS on
the mainboard of a computer is used to boot and control the system. The
SCSI BIOS on your host adapter acts as an extension of the system
BIOS.
Bit A binary digit. The smallest unit of information a computer uses. The
value of a bit (0 or 1) represents a two-way choice, such as on or off,
true or false, and so on.
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 via taps 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 A topology in which every processor is connected to two others, except
for two end processors that are connected to only one other.
CISPR A special international committee on radio interference (Committee,
International and Special, for Protection in Radio).