Panasonic JB-3300 Technical Manual page 181

EN EVEN is synchronized to CRT Memory Access timing in the TEXT
80x25 display mode by CRT CASO. Signal timing is shown below.
Basic-CLK
CLK1 A, [
(TEXT80x25)
CRTC-CLK
CRT CASO
EN EVEN
| |
(The Other Mode) \
CRTC-CLK .
mrs '\ '|
"=
Figure 5-37 CRTC CLOCK Control Circuit Timing Chart
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