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Vertical Sync
•
Uses polarity of Vertical Sync signal to automatically select
Mode 1 or Mode 2 operation. Mode 1 is selected by a
normally low positive going TTL pulse. Mode 2 is selected by
a normally high negative going TTL pulse.
•
Screen may be refreshed from 50 to 60 Hz. At 60 Hz there
are either 200 or 350 vertical lines of resolution depending
on the mode selected.
•
700
ILsec
retrace time
Horizontal Sync
•
Normally low, positive going TTL pulse
•
In Mode 1, 15.75 kHz.
•
In Mode 2,21.8 kHz.
•
6
ILsec
retrace time
IBM Enhanced Color Display 3
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