Quantum Data 801GC, 801GF, 801GX, Owner'S And Programmer'S Manual

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6-12
Chapter 6: Programming
Model 801GC, 801GF & 801GX¥Rev. A
half the number of lines in one vertical period for
interlaced formats. The current reference rate is
marked with an asterisk.
The Horizontal Period is always equal to the sum
of the Horizontal Active and the Horizontal Blank-
ing times. The 801G* uses two of these parameters
as references to calculate the third. The last two edited
parameters will always be used as the references.
The current references are marked with asterisks.
The horizontal period, in microseconds, is the re-
ciprocal of the horizontal rate. Entering a new real
time value for the horizontal period will re-calcu-
late the horizontal rate and make it the reference
rate.
The Vertical Period is always equal to the sum of
the Vertical Active and the Vertical Blanking peri-
ods. For interlaced formats, these periods are for an
entire frame (2 fields) of video. The 801G* uses two
of these parameters as references to calculate the
third. The last two edited parameters will always
be used as the references. The current references are
marked with asterisks. The vertical period, in milli-
seconds, is the reciprocal of the frame rate. Entering
a new real time value for the vertical period will re-
calculate the vertical rate and make it the reference
rate.
The horizontal and vertical Physical size parameters
are the physical dimensions of the active video area
of the display you will be driving with the format
They do not affect the timing of any of the signals
coming out the 801G* or the overall active video
size of an image. However, they do affect the way
some of the built-in test images will appear on the
display’s screen. The 801G* uses this information to
properly draw true circles and squares as well as
brightness boxes that are supposed be specific physi-
cal sizes. Using the wrong values may cause circles
to look like ovals and square boxes to look like rect-
angles.