Terminology - 89
Tracking Outputs computer signals at a pre-determined frequency. The image will not be
projected clearly unless this frequency is aligned with the frequency of the projec-
tor. Aligning the signal frequency is known as tracking. Projected images will be
subject to distrubance, blurring and horizontal noise if not synchronized.
USB An abbreviation for Universal Serial Bus. This is an interface for connecting com-
paritively low frequency equipment to the computer.
UXGA IBM PC/AT compatible (DOS/V equipment) signals with 1,600 horizontal pixels
and 1,200 vertical pixels.
VGA IBM PC/AT compatible (DOS/V equipment) signals with 640 horizontal pixels
and 480 vertical pixels.
XGA IBM PC/AT compatible (DOS/V equipment) signals with 1,024 horizontal pixels
and 768 vertical pixels.