Canon A-200 series Service Manual page 111

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OSC
(14MHz)
CRT-ClK
CPU/CRTC
RAS
h
h
--­
I
I
r
I
I
I
~
II
I
CAS
CPU-RAS ADDR
CPU-CAS ADDR
CPU-ADDR
)
-.-J
---,
ROWX
I
I
COLUMN
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I
I
I
J
I
I
II
ROW
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X
1
COLUMN
CRTC-RAS ADDR
I
I
CRTC-CAS ADDR
I
I
o
to
CRTC-ADDR
CH-lATCH
AT-lATCH
(CRT-ClK)
sf[
DOT-ClK
(7MHz)
J
J
I
I
I
I
I
I
I
ROW
I
I
X
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I
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COLUMN
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I
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lATCH-DATA CLEAR
r
DISP
I
DISP(CRTC)
ADDR(CRTC)
I
X
0
y - ­
lATCH ADDR
X
MA=O
40 x 25 CHARACTERS TEXT MODE TIMING
Figure 6-43

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