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Page 19-3GLOSSARY
adjust each of the parts so they all work together.
Control code A byte of information representing a
print instruction (e.g., a tab).
Control Unit The portion of the CPU that directs the
step-by-step operation of the entire
computing system.
Count byte A byte that indicates the number of
bytes to follow in an escape sequence.
CPI Characters per inch.
CR Carriage return.
CR/LF Carriage return/line feed.
CRT Cathode ray tube. A video display
terminal.
CTS Clear to send. A hardware handshaking
method in serial interfacing.
D
Data bits Word length. The number of data bits in
a word.
Data stream Information transmitted between the
host system and the ULTRA.
DB-25 A plug with 25 male or female pins,
most commonly used with an RS-232-C
serial interface.
Decimal A base 10 numbering system.
Default Formatting configurations that are
present and are used automatically
when no other information is available.
Delimit To mark the beginning and end of a
character string.
Diagnostic A routine designed to verify the
operation of a system and to find a
malfunction in a device.
Dip switch Dual In-line Package switch. Used on
the ULTRA rear panel to modify the
functions of the unit.