Toshiba Tecra A8 cursor, device, devices, CPU cache, 290 Glossary, directory — See folder, cache, L1 cache, L2 cache, to communicate with a device

290 Glossarycontroller — A device that controls the transfer of data from a computer

to a peripheral device and vice versa. For example, disk drives, monitors, keyboards, and printers all require controllers.

CPU — See central processing unit (CPU).

CPU cache — A section of very fast memory residing between the CPU and the computer’s main memory that temporarily stores data and instructions the CPU will need to execute commands and programs. See also cache, L1 cache, L2 cache.

cursor — A symbol that indicates the current position on the screen. The shape of the cursor varies, depending on the program you are using and what you are doing.

D	default — The setting selected by a program when the user does not
	specify an alternative setting.
	device — A component attached to the computer. Devices may be
	external (outside the computer’s case) or internal (inside the
	computer’s case). Printers, disk drives, and modems are examples of
	devices.
	device driver — A program (called a “driver”) that permits a computer
	to communicate with a device.
	dialog box — An on-screen window displayed by the operating system
	or a program giving a direction or requesting input from the user.
	direct current (DC) — The type of power usually supplied by batteries.
	DC flows in one direction. Compare alternating current (AC).
	direct memory access (DMA) — A dedicated channel, bypassing the
	CPU, that enables direct data transfer between memory and a
	device.
	directory — See folder.
	disable — To turn a computer option off. See also enable.
	disc — A round, flat piece of metal, designed to be read from and written
	to by optical (laser) technology, and used in the production of optical
	discs, such as CDs and DVDs. Compare disk.