A toggle key on the keyboard that makes all letters type uppercase, but does not affect the numeral, punctuation, or function keys. Cards are smaller than boards. Usually goes with a line feed. Named after the carriage return lever on a typewriter. DOS commands and filenames are not case sensitive.
Passwords frequently are case sensitive.
CD C ompact D isc. Note the spelling of disc. O nly M emory. The most common parallel interface in microcomputing, used especially for printing. The company Centronics is no longer in existence.