Apple Lisa - Video Circuit

Confidential
Lisa Hardware Reference Manual
7-Jul-81.
VIDEO CIRCUIT
The display is 6.325 inches high and 8.5 inches wide. There are a total
of 374 horizontal lines of Which 360 are active. 720 of the 886 vert~cal
lines are active. There are, therefore, 259,200 active elements in the
full display.
The dot clock frequency is 20.0 MHz, so the dot clock time is 50 nanoseconds.
The active line time (the dot clock time times 720) is 36 microseconds,
and the inactive line time (dot clock times 176) is 8.8 microseconds. The
line frequency is 22,321.429 Hz. The frame frequency is 59.68 Hz. The
screen aspect ratio (width/height) is 4/3. The dot aspect ratio is 2/3.
374
LINES
TOTAL
THE VIDEO DISPLAY
J3"
/a
8~"
72000TS
(4Sa 18)
Active
Video
Area
360
Number of Activ. Oisplay Elements
LINES
720 X 360 = 259,200
f14 LINES
Page 20
176 -
OOTS
(11 II 11)