Digital Equipment LGplus Series, Руководство по установке

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Glossary–2
buffer A reserved area in memory where data is written and read during
data transfers.
bus A circuit for the transfer of data or electrical signals between two
devices.
C
character cell The invisible rectangular space occupied by a character, including
the white space around the character. The height of a cell remains
constant even with changes in the current line spacing, and the
width is equal to the current character spacing. Used as a unit of
spacing.
character proportion The ratio of character height to character width.
See also compressed and expanded.
character set A set of codes, each of which represents a printable character,
including symbols, punctuation, numbers, diacritical markings,
and alphabet characters. Each character is assigned a unique code
value.
character weight The degree of lightness and thickness of printed text. For
example: “Bold” refers to a heavy or thick character weight.
“Medium,” “normal,” or “book weight” refer to the character
weight used in this sentence.
checksum A stored or transmitted numerical value used to verify data
integrity.
command sequence Two or more bytes that instruct the printer to perform a special
function. The first character in the sequence is a special function
control character (SFCC), which alerts the printer that the string
is a command sequence.
See also escape sequence, SSCC, and SFCC.
compatibility The ability of one printer to accept and properly process
commands meant for a different printer.
See also emulation and protocol.