IBM XT 5160 Technical Reference page 379

contiguous. Touching or joining at the edge or boundary;
adjacent.
control character. A character whose occurrence in a particular
context initiates, modifies, or stops a control operation.
control operation. An action that affects the recording,
processing, transmission, or interpretation of data; for example,
starting or stopping a process, carriage return, font change,
rewind, and end of transmission.
control storage. A portion of storage that contains microcode.
coordinate space. In computer graphics, a system of Cartesian
coordinates in which an object is defined.
cps. Characters per second.
cpu.
Central processing unit.
CRC. Cyclic redundancy check.
CRT. Cathode ray tube.
CRT display. Cathode ray tube display.
CTS. Clear to send. Associated with modem control.
cursor. (1) In computer graphics, a movable marker that is used
to indicate position on a display. (2) A displayed symbol that
acts as a marker to help the user locate a point in text, in a system
command, or in storage. (3) A movable spot of light on the
screen of a display device, usually indicating where the next
character is to be entered, replaced, or deleted.
cyclic redundancy check (CRC). (1) A redundancy check in
which the check key is generated by a cyclic algorithm. (2) A
system of error checking performed at both the sending and
receiving station after a block-check character has been
accumulated.
cylinder. (1) The set of all tracks with the same nominal
distance from the axis about which the disk rotates. (2) The
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