Toshiba M105-S3004 User Manual - Page 262

megabyte (MB) GLOSSARY megabyte (MB): A unit of data storage equal to 1024 kilobytes. See also kilobyte. megahertz: A unit of wave frequency that equals 1 million cycles per second. See also hertz. menu: A software interface that displays a list of options on the screen. Also called a screen. microprocessor: A hardware component contained in a single integrated circuit that carries out instructions. Also called the central processing unit (CPU), one of the main parts of the computer. mode: A method of operation, for example, the boot mode or the resume mode. modem: Derived from modulator/ demodulator, a device that converts (modulates) digital data for transmission over telephone lines and then converts modulated data (demodulates) to digital format where received. monitor: A device that uses rows and columns of pixels to display alphanumeric characters or graphic images. See CRT. motherboard: A name sometimes used to refer to the main printed circuit board in processing equipment. It usually contains integrated circuits that perform the processor's basic functions and provides connectors for adding other boards that perform special functions. Sometimes called a main board. N non-system disk: A formatted diskette (floppy disk) you can use to store programs and data but you cannot use to start the computer. See system disk. nonvolatile memory: Memory, usually read-only (ROM), that is capable of permanently storing information. Turning the computer's power off does not alter data stored in nonvolatile memory. numeric keypad overlay: A feature that allows you to use certain keys on the keyboard to perform numeric entry, or to control cursor and page movement. O Glossary-10 OCR: Optical Character Recognition (reader). A technique or device that uses laser or visible light to identify characters and input them into a storage device.