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 51/4-inch double-
density diskette can store 360KB of data. A 31/2-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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