Printronix ANSI Printer manual Nack, Nlq, Nvfu, Nvram, Ocr

	N
N/A	Not available or not applicable.
NACK	Negative-Acknowledge reply. A reply from the printer
	to the host indicating that an exception has occurred.
	Contrast with acknowledge character.
NAK	Negative-Acknowledge character. A transmission
	control character transmitted by the printer as a
	negative response to an enquiry from the host.
NL	New Line (3287 only).
nibble	A unit of storage containing half of a byte, usually
	four bits.
NLQ	Near Letter Quality.
Not Ready mode	Offline. The printer is not ready to receive and
	process commands and data.
nS	Nanosecond (one billionth of a second)
NVFU	Direct Access Vertical Format Unit. See also
	DAVFU.
NVRAM	NonVolatile Random-Access Memory. A type of
	RAM in which stored data are not lost when the
	power is interrupted or turned off. A battery supplies
	power to NVRAM when the system does not. Unlike
	ROM (another type of nonvolatile memory), NVRAM
	is accessible and its contents can be altered.
	O
OCR	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.
off-line	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.
Ohm	A unit of measurement for electrical resistance.
on-line	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.

93