Canon A-200 series Service Manual page 113

• Video Output
80
x
25 or 40
x
25 Characters Text Mode
A data latched at the CH-lATCH and the AT-lATCH signals is divided into the ROM address and
the attribute data.
At the moment when the ROM address is decided, a data is output from the character generator
(2364). This data is input to the shift register (U25; lS166) together with the S/l signal and shifted
per one bit. This CH data is mixed with the AT data and then latched to output.
Note that the cycle of the fundamental clock signals (DOT-ClK, CH.lATCH, AT-lATCH,
SIC)
are
different in both display mode.
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