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Each of four adapter output signals to a display is tested in order to isolate adapter and display failures.
English (United States)
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Adapter and Display Testing
Each of four adapter output signals to a display is tested in order to isolate
adapter and display failures.
Horizontal and vertical retrace, bright, and video signals are applied along
separate lines to a group of tri-state drivers along with an even scan time from an
odd/even latch. Video is input to the latch. The driver outputs are applied to
respective lines on a data bus. In order to test the signals output to the display, a
test line to the group of drivers is activated for turning on the drivers. This results
in a data byte being applied along the data bus corresponding to the signal levels
on the horizontal and vertical retrace, bright, and video lines. A processor is
connected to the data bus for monitoring the data applied therealong for
changes. Utilizing an internal timer, the processor measures each line bit change
for proper timing. If proper, and there is no appropriate display of information,
then a display failure is signified. Otherwise, an adapter failure is signified.