Megabyte (MB)

A unit used to measure storage space in a computer’s memory or on a disk. One megabyte equals 1024KB (kilobytes). See also Byte.

Megahertz (MHz)

A unit used to measure oscillation frequency, such as that of a computer’s internal clock. A megahertz is one million cycles per second.

Memory

The circuitry in your computer that stores data for possible retrieval. Memory contents are stored permanently (in ROM) or temporarily (in RAM).

Memory manager

A program that controls the memory in your computer so that different applications do not try to use the same portion of extended memory at the same time.

Memory module

A small circuit board that contains surface-mounted memory chips. You can add memory modules to the main system board to expand your computer’s memory. Commonly called a SIMM (single inline memory module).

MGA

Multi-mode Graphics Adapter. A type of display adapter card that can display monochrome text and color graphics on the screen.

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