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Glossary
OCR
off-line
Ohm
on-line
parity (check)
parsing
PC
PCB
106
(another type of nonvolatile memory), NVRAM is
accessible and its contents can be altered.
O
Abbrev. for Optical Character Recognition. A process by
which a machine can "read" characters printed in a
special standardized font. Data are read by a
photoelectric optical scanner and recorded on magnetic
tape or disk. OCR-A and OCR-B are two widely used
OCR fonts.
An operational state in which the printer cannot accept
commands or data from the host computer, but can
perform self-tests, form settings, and record configuration
changes.
A unit of measurement for electrical resistance.
An operational state in which the printer is under direct
control of the host computer. In this state, the printer
accepts commands and data sent from the host
computer, and acts on them immediately.
P
Parity checking is the addition of non-data bits to data,
resulting in the number of 1 bits being either always even
or always odd. Parity is used to detect transmission
errors. Parity represents the value in the check digit of
the received or transmitted data.
The process of separating a programming statement into
basic units that can be translated into machine
instructions. A printer can recover from an erroneous
code sequence by performing as much of the function as
possible or parsing the valid parameter from the invalid.
Abbrev. for Personal Computer.
Abbrev. for Printed Circuit Board. A PCB is an insulating
board on which circuit paths have been printed or etched.
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