DOS

Disk Operating System. A commonly used operating system that controls the computer’s input and output functions. See also Operating system.

Double-density

A type of diskette format that allows you to store twice as much data as the standard-density format. A 5%-inch double- density diskette can store 360KB of data. A 3%inch double- density diskette can store 720KB of data.

Drive designator

The letter name of a disk drive, followed by a colon-for example, C : .

EGA

Enhanced Graphics Adapter. A type of display adapter card that allows you to display high-resolution graphics on a compatible monitor. It can display up to 43 lines of text with 80 characters on each line, or it can display monochrome or 16-color graphics at resolutions up to 640 x 350.

Expanded memory

Memory that specially written MS-DOS application programs can use with an Expanded Memory Specification (EMS) device driver such as EMM386SX.SYS.

Extended Memory

Memory above 1MB that is accessed by the protected mode of the 80386SX microprocessor and is available to some application programs and operating systems.

Extension

A suffix of up to three characters which you can add to a filename to better identify it.

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