Epson Apex 20020, 20040 User Manual page 235

Input/output (I/O) port
See Port.
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. This means that you can execute an internal command
without specifying a pathname. Examples include COPY, DEL,
RENAME, and DIR. Unlike external commands, internal
commands can be executed from any drive or directory.
Jumper
A small device that fits over two small pins on a circuit board
to activate a particular function.
Keyboard
A device resembling a typewriter keyboard to enter letters and
numbers to the computer.
Kilobyte (KB)
A unit used to measure storage space in a computer's memory
or on a disk. One kilobyte equals 1024 bytes.
Logical disk drive
A subdivision of a physical disk drive, treated by MS-DOS as
though it were a separate physical component of the computer.
A physical disk drive may be divided into several logical drives.
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