Canon A-200 series Service Manual page 115

320
x
200 Pixels Graphics Mode
All dot data corresponding to the pixels on the CRT has 2 bits of information. Therefore,
various colors can be displayed.
A data latched with the CH-lATCH and AT-lATCH signals is loaded at the U35 and U36 (lS166)
and is shifted per one bit at the rising edge of the next clock cycle. This data is output synchronizing
with the DOT-ClK Signals after a color information is mixed to it.
As mentioned above, since one dot consists of 2 bits, four (22) colors can be displayed.
640 x 200 Pixels Graphics Mode
Basically, a method of displaying for this mode is identical to the 320 x 200 pixels mode. How­
ever, since every dot to be displayed corresponds to every bit, no color except black and white
can be used.
Data outputs from the QH terminals of the U35 and U36 are output by enabling with thp
C1-EN and CO-EN Signals at the U52.
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