TM 5-6675-316-14
(k) The Y-dot counter counts the horizontal scan lines in a character row.
(1) The Y-field counter counts the character rows on the screen. As the
number of scan lines is completed, the Y-dot counter increments the Y-field counter
by one. When the row count is satisfied, the Y-field counter generates a vertical
drive signal.
(4) The display memory receives information from the computer, and stores the
characters to be displayed on the screen. It also gets addressing information from
the X and Y field counters. This information determines the position on the screen
that the next character will be displayed. The next required character is fed to
the character data buffer. This buffer stores the next character information while
other data is fed into the display memory, and the character generator matrix ROM
processes the last character.
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