10 Glossary
port
Provides the means for an interface between the microprocessor and external
devices. A cable connector is usually plugged into the port to attach the de-
vice to the computer.
processor
In a computer, a functional unit that interprets and executes instructions.
prompt
A special symbol indicating the beginning of an input line. Also a message
that appears on the screen indicating that the user must take a certain action.
R
RAM
Random Access Memory. A storage device into which data is entered and
from which data is retrieved in a nonsequential manner.
read
To extract data from a storage device such as a diskette.
ROM
Read-Only Memory. Memory in which stored data cannot be modified by
the user except under special conditions.
reset
The process of returning a device to zero or to an initial or arbitrarily se-
lected condition.
resolution
The degree of screen image clarity. Video display resolution is determined
by the number of pixels on the screen. Resolution is usually specified in pix-
els by scan lines, for example, 640 by 480. See pixels.
RS-232C
Standard interface for serial devices. This port is sometimes referred to as
the serial port.
