Memory module

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

M G A

Multi-mode Graphics Adapter. A display adapter card that can display monochrome text and color graphics.

Microprocessor

A small CPU on one semiconductor chip. See also CPU.

Modem

MOdulator/DEModulator. A device that allows a computer to transfer data to and from another computer by transmitting signals over telephone lines.

Monochrome monitor

A monitor that displays in only one color (such as green, white, or amber).

Mouse

A hand-held pointing device with one or more buttons. Sliding the mouse over a surface moves the cursor in the same direction on the screen. Pressing (or clicking) a mouse button selects the item on the screen at the cursor position.

MS-DOS

Microsoft Disk Operating System. The operating system most commonly used with your computer. See also DOS, OS/2, and Operating system.

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