GLOSSARY
XEROX 4890 HIGHLIGHT COLOR LPS PRODUCT REFERENCE
GLOSSARY-17
protocol
Formal set of conventions governing format of data and control
of information exchange between two communication devices.
proportional font
Font containing characters that vary in width.
proportional spacing
Text where each alphanumeric character is given a weighted
amount of space. Such output has print-like appearance.
Proportional spacing allows more space for wide characters and
less space for narrow characters.
proportional type
Characters that vary in width.
PSC
Printer subsystem controller. Command and task that download
the printer and/or raster image processor (RIP) software if
selected.
query
Request for data or other information, entered by an operator
while the system is processing.
queue
Managed database of documents waiting to be processed.
RAM
Random access memory.
raster data
Binary data, usually consisting of dots arranged in scan lines,
according to the print order.
raster image processor
See RIP.
rasterization
The creation of a bitmap image on a page for printing.
read-only memory
See ROM.
read/write head
A small electromagnet that reads, writes, and erases data in the
form of magnetic dots on the surface of an external storage
medium, such as a magnetic disk.
real time
To process transactions as they are entered into a system. User
and system interchange allow transactions to be processed and
the results returned to the user.
remote access
Access to a central computer by terminals or devices
geographically separated from that computer.
RGB
A printing industry standard color definition model where all
colors are defined in terms of values for the three additive
primary colors: red, green and blue. Refer to color definition
model.
ROM
Solid-state memory for programs. It cannot be rewritten.
