User's Manual

Track ball
A pointing device that consists of a ball in a socket mounted
over motion sensors. When you roll the ball in a certain direc-
tion, the cursor moves in that direction on the screen.
Tracks
Addressable, concentric circles on a diskette, resembling the
grooves on a record, which help to divide the diskette into
separate accessible areas. There are 40 tracks on each side of a
double-sided 360KB diskette.
TTL
Transistor to Transistor Logic. A type of integrated circuit logic
that accepts digital input. The Apex monochrome monitor uses
a TTL circuit to produce its screen display.
VGA
Video Graphics Array. A type of high-resolution color monitor
that can display monochrome text and graphics at 720 x 400
resolution, 16-color graphics at 640 x 480 resolution, or 256-
color graphics at 320 x 200 resolution.
Wildcard
A character that represents an unknown character or group of
characters. The wildcard character * (asterisk) represents a
group of characters, and the wildcard character ? (question
mark) represents a single character.
Write
To store data on a disk.
Write-protect
To prevent a diskette from being overwritten by placing a
write-protect tab over the notch on the side of a 5 l/4-inch
diskette. When a diskette is write-protected, you cannot erase,
change, or record over its contents.
12 Glossary