Commodore 128 System Manual page 431

EPROM: A PROM that can be erased by the user, usually by
exposing it to ultraviolet light. See PROM.
Error Checking or Error Detection: Software routines that identify,
and often correct, erroneous data.
Execute: To perform the specified instructions in a command or
program statement.
Expression: A combination of constants, variables or array
elements acted upon by logical, mathematical or relational
operators that return a numeric value.
File: A program or collection of data treated as a unit and stored
on disk or tape.
Firmware: Computer instructions stored in ROM, as in a game
cartridge.
Frequency: The number of sound waves per second of a tone.
The frequency corresponds to the pitch of the audible tone.
Full-Duplex Mode: Allows two computers on the same line to
transmit and receive data at the same time.
Function: A predefined operation that returns a single value.
Function Keys: The four keys on the far right of the Commodore
128 keyboard. Each key can be programmed to execute a
series of instructions. Since the keys can be SHIFTed, you
can create eight different sets of instructions.
Graphics: Visual screen images representing computer data in
memory (i.e., characters, symbols and pictures).
Graphic Characters: Non-alphanumeric characters on the
computer's keyboard.
Grid: A two-dimensional matrix divided into rows and columns.
Grids are used to design sprites and programmable
characters.
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