point

A unit of length in printing and typography, used to

 

specify type sizes, heights of font characters, etc.

 

There are 72 points in a vertical inch; thus, one point

 

equals 1/72 inch, or approximately 0.0138 inch.

 

Some examples of point sizes are: This is 8 point type.

 

This manual is printed in 10 point type. This is 14

 

point type.

POR

Power On Reset.

port

A channel used for receiving data from or

 

transmitting data to one or more external devices.

portrait

Printed parallel to the short edge of a page.

Postnet

A bar code standard defined by the United States

 

Postal Service.

print mode

Synonym for print attribute. Includes character

 

attributes such as italic, underlining, super/subscript,

 

as well as Draft, NLQ, and DP.

protocol

In general, a set of rules governing the exchange of

 

information between computer systems. For printers,

 

a protocol is the coding system used to convey and

 

print characters and graphics. A printer protocol

 

includes character codes, printer function codes, and

 

machine-to-machine communication codes. In this

 

manual, protocol and emulation mean the same

 

thing. See also compatibility and emulation.

PSA

Printronix System Architecture. A print engine design

 

that puts all data and electro-mechanical control logic

 

on one circuit board. The use of flash memory on this

 

board permits rapid access to stored printer

 

emulations and fast processing of print data.

 

R

RAM

Random-Access Memory. Also called “main

 

memory” or “working memory,” this is the active

 

memory of a printer, into which programs are loaded.

 

This memory can be read from or written to at any

 

time-hence the term “random-access.” RAM is also

 

termed “volatile” because whatever is in RAM is lost

 

when power is turned off or interrupted. See also

 

ROM.

RD

Receive Data. Serial data stream to the printer.

read

To retrieve data from memory (RAM, NVRAM) or

 

mass storage (hard disk, floppy diskette, etc.).

Ready mode

Online. The printer is ready to receive and process

 

commands and data.

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Printronix ANSI Printer manual Por, Psa, Ram, Rom