QMS PS 410, User Manual

Page: 275 / 288

Printer Driver
A printer driver is a file that enables the application program to talk with
the printer. Usually, the printer driver is installed within an applications
program.
PROM
An acronym for Programmable Read Only Memory. A storage device that
can be programmed by electrical pulses. A PROM does not lose its
memory when the printer is powered off.
Proportional Spacing
In proportional spacing, horizontal spacing between characters and sym-
bols in a font varies according to the width of the character. For example,
an i takes up much less horizontal space than a w in proportional spacing.
See fixed spacing.
Protocol
A set of procedures that control how data is transmitted between devices.
RAM
An acronym for Random Access Memory, RAM specifies the memory
that is transient. Information or data in RAM is lost when the power is
turned off or severely interrupted.
Raster Graphics
The system of forming graphics using a bitmap, or grid of small dots, is
called raster graphics. The term raster denotes the Cartesian grid system
in which the dots are arranged. Bitmaps can define images, shapes, or
characters created with a specific number of dots per inch. See bitmap.
G l o s s a r y G - 1 3