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Abbreviation for Celsius.
cache
To facilitate quicker data retrieval, a storage area for keeping a copy of data or instructions. For example, your
computer's BIOS may cache ROM code in faster RAM. Or, a disk-cache utility may reserve RAM in which to store
frequently accessed information from your computer's disk drives; when a program makes a request to a disk drive for
data that is in the cache, the disk-cache utility can retrieve the data from RAM faster than from the disk drive.
card-edge connector
On the bottom of an expansion card, the metal-contact section that plugs into an expansion-card connector.
CCFT
Abbreviation for cold cathode fluorescent tube.
CD-ROM
Abbreviation for compact disc read-only memory. CD-ROM drives use optical technology to read data from compact
discs. Compact discs are read-only storage devices; you cannot write new data to a compact disc with standard CD-
ROM drives.
CGA
Abbreviation for color graphics adapter.
CIO
Abbreviation for comprehensive input/output.
cm
Abbreviation for centimeter(s).
CMOS
Acronym for complementary metal-oxide semiconductor. In computers, CMOS memory chips are often used for
NVRAM storage.
COM n
The MS-DOS device names for the first through fourth serial ports on your computer are COM1, COM2, COM3, and
COM4. MS-DOS supports up to four serial ports. However, the default interrupt for COM1 and COM3 is IRQ4, and
the default interrupt for COM2 and COM4 is IRQ3. Therefore, you must be careful when configuring software that
runs a serial device so that you don't create an interrupt conflict.
CON
The MS-DOS device name for the console, which includes your computer's keyboard and text displayed on the screen.
config.sys file
When you boot your computer, MS-DOS runs any commands contained in the text file config.sys (before running any
commands in the autoexec.bat file). A config.sys file is not required to boot MS-DOS, but provides a convenient place
to run commands that are essential for setting up a consistent computing environment—such as loading device drivers