HP QMS 1660E - Manual (Page 285)

Protocol
Glossary G-13
2 emulation is the native language of your printer’s controller. It describes
text, graphics, and page images to the printer.
Previous Key
The control panel key that returns through the list of previous selections or
options for the current menu. When changing the character information,
use this key to return to the previous choice for the current input (underlined)
character.
Print Density
Print density refers to the relative darkness of print on the page. Very dense
print appears totally black. Less dense print looks lighter, with solid-filled
areas not totally covered. Print density can be adjusted by a lever inside
the printer.
Print Engine
The non-intelligent portion of the printer, including the laser, print drum, and
paper-feeding mechanism.
Print Quality
A general measure of the appearance and readability of a printed page.
Criteria of print quality include the darkness, clarity, and sharpness of the
printed page.
Printed Circuit Board
A flat board made of plastic, fiberglass, or another nonconducting material
on which chips and other electronic components are mounted.
Printer Driver
A printer driver is a program that translates the file you are printing into a
language that the printer understands. Usually, the printer driver is installed
within an application.
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. See also
EEPROM, EPROM.
Protocol
A set of rules or standards designed to enable computers and other devices
to connect to one another and to exchange information.