Digital Equipment DEC 3000 500X AXP Owner's Manual page 251

hardware
The physical equipment—mechanical and electrical—that makes
up a system. Compare with software.
hexadecimal
A numbering system using the base 16 that is a shorthand
method for representing binary numbers. Using this method,
each four bits is converted into a single hexadecimal digit. For
example, 1001 in binary is equal to 9 in hexadecimal.
hit
Indicates that a valid copy of a desired memory location is
currently in cache.
icon
A graphical symbol on the system unit or window that identifies
drives, ports, switches, indicators, and programs running in the
background. Symbols displayed on a window represent an action
the computer can take. The symbol replaces a command you
would otherwise type.
IEEE
Abbreviation for Institute of Electrical and Electronics
Engineers.
initialization
The sequence of steps that prepare the system to start.
Initialization occurs automatically after a system has been
turned on.
input/output (I/O) device
A piece of equipment that transmits data to (input) and from
(output) the system. For example, a terminal or a mouse. See
mouse.
Integrated Services Digital Network (ISDN)
An international telecommunications standard that allows a
communications channel to simultaneously carry voice, video,
and data.
Glossary–14