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8 Glossary
PC Card
A credit-card–sized peripheral interface standard for portable devices. Types of PC
cards (also known as PCMCIA cards) currently offered by major vendors include
fax/modems, LAN, storage cards, and wireless communications devices.
peripheral
Input or output device not under direct computer control. A printer is a peripheral
device.
pixels
Picture elements. Tiny dots that make up a screen image.
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 device 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.
Q
QWERTY
The QWERTY keyboard, designed in the 1800s for mechanical typewriters, refers to
the first six keys (QWERTY) on the top row of letters on the standard keyboard.
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.