Interface

A physical or software connection used to transmit data between equipment or programs.

Internal command

An MS-DOS command that is stored in the command processor of the operating system; it is not a separate program file. Examples include COPY, DEL, RENAME, and DIR.

Jumper

A small device that connects two pins on an option card, the SIMM card, or the main system board to activate a particular function.

Key disk

A diskette containing a copy-protected program that must remain in the diskette drive while you are using the program.

Kilobyte (KB)

A unit used to measure storage space in a computer’s memory or on a disk. One kilobyte equals 1024 bytes.

LIM EMS

The Lotus/Intel/Microsoft Expanded Memory Specification-a protocol that allows certain application programs to use memory that MS-DOS cannot use.

Logical disk drive

A subdivision of a physical disk drive, which MS-DOS treats as though it were a separate physical component of the computer. A physical disk drive may be divided into several logical disk drives.

G l o s s a r y 1 1