IBM 4400 manual Ram, Rom

Print Pitch	Defines the number of characters that can be printed in
	one inch. It can be translated into the width of the
	character.

Printer Configuration The operating properties that define how the printer responds to signals and commands received from the host computer. These properties are set to match the operating characteristics of the host computer system.

Printer Interface	The point where the data line from the host computer
	plugs into the printer.
Protocol	A set of rules or conventions governing the exchange of
	information between computer systems. For computer
	printers, a protocol is the coding convention used to
	convey and print data. A printer protocol includes
	character codes, printer function codes, and machine-
	to-machine communication codes.

	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. RAM is said to
	be volatile because data in RAM are lost when power is
	turned off or interrupted. Compare with ROM.
Read	To retrieve data from memory or mass storage (hard
	disk, floppy diskette, RAM, etc.).
Reset	To turn off, deactivate, disable, or return to a previous
	state.
Resolution	A measure expressing the number of component units
	in a given range used to create an image; in printing,
	expressed as the number of dots per inch (dpi)
	horizontally and vertically.
ROM	Read-Only Memory. Programs, instructions, and
	routines permanently stored in the printer. ROM is not
	lost when power is turned off and cannot be written to-
	hence the name “read only.” ROM-resident fonts are
	permanently stored in a printer and available at any
	time via software commands. Compare with RAM.

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