Quantum Data 801GC - Manual (Page 171)

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nal levels in the 1 Vp-p range. Digital displays are
more limited and can only display a couple of gray
levels or a handful of pre-defined colors. These dis-
plays normally accept TTL video signals in the 4
Vp-p range.
Analog Video and Sync Parameters
If you are entering a digital video format, skip this
section of the manual and go on to the “Digital Video
Parameters” section. If you are working with an
analog video display, set DVST to zero. Enter the
correct analog video signal type for the AVST com-
mand. Both monochrome and color signal types are
supported.
The following figure shows a typical video wave-
form for either a monochrome or RGB color display:
ASSS
Ground
AVPS
(% of AVSS)
AVSS
Black
Level
Blanking
Level
❖ A few displays require an inverted waveform
with negative-going peak video and positive
going sync tips. The 801G* will not properly drive
these types of displays.
The AVSS parameter sets the peak-to-peak swing of
the video portion of the composite waveform. This
swing includes any blanking pedestal that may be
present and excludes any sync pulses that may be