backup copy
A copy of files or software made for safekeeping. Making a
backup copy of the data stored on your disk allows you to recover
that data after an accidental loss. You can make backup copies
on tape cartridges, or over a network using the Remote System
Manager.
baud rate
The speed at which signals are serially transmitted over a
communications line. Baud rates can be measured in bits per
second or characters per second. One baud equals one bit per
second; eight bauds equals one character per second.
bit
A binary digit; the smallest unit of information in a binary
system of notation, designated as a 0 or a 1.
BIU
See bus interface unit.
boot
Short for bootstrap, meaning to bring a device or system to a
defined state where it can operate on its own.
boot (or bootstrap) device
The memory storage device that holds the software that carries
out a system bootstrap procedure.
boot flag
An indicator bit, set by the system manager, that contains
information that is read and used by the bootstrap software
during a system bootstrap procedure. Default boot flags should
already be set when you receive your system.
bootp
An Internet protocol used for network booting. It is based on
UDP (the Internet User Datagram Protocol) which is a simple,
reliable datagram protocol. The bootp protocol allows a diskless
machine to find its Internet address, the address of a bootserver,
and the name of a file to boot.
Glossary–3
