Quantum Data 801GC, 801GF, 801GX manual LinFocus

LinFocus

Description	The image consists of several parts. It starts with
	a large circle in the center of the screen. Its
	diameter equals the lesser of the video height or
	width of the display. The second part is a 10 by
	10 box crosshatch pattern. The crosshatch is drawn
	in from the outside edges, with any extra pixels
	in the boxes placed along the vertical and
	horizontal axis. The vertical centerline is two pixels
	thick if the format has an even number of active
	pixels per line. The horizontal centerline is two
	pixels thick if the format has an even number of
	active lines per frame. A smaller box is added at
	the center of the image. The box is one-half the
	height and two-fifths the width of one of the
	crosshatch boxes. Current format data is shown
	in the lower left quadrant of the image. It shows
	the number of active pixels (H) and lines (V) as
	well as the vertical and horizontal scan rates.

640 x 480

H= 31.469 KHz V= 59.940 Hz

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