Digital Equipment DEC 3000 Series Service Information page 411

GKS (Graphical Kernel System) application
An application that uses the GKS graphics system and language
to create two-dimensional (2D), three-dimensional (3D), and
raster images on the screen. A GKS application can be developed
on one system and easily moved to another system.
graphics
A computer output of drawings, charts, and graphs.
half-height disk
Any 1 5/8-inch fixed drive that is 3½ inches (9-centimeters) wide,
such as those in the RZ family; or a 1 5/8-inch removable drive
that is 5-inches (12.7-centimeters) wide, such as a compact disc.
halt
The action of stopping the CPU from processing. This action
brings the system under the control of the console program. A
halt can occur when an internal system error is detected, when
you enter the HALT command at the console terminal, or when
you press the Halt button on the back of the system unit.
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.
Glossary–11