Canon A-200 series Service Manual page 61

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WRITE
Address
CHO base, current address
0001
0000
CHO base, current word count
0002 CH1 base, current address
0003
CH1 base, current word count
0004 CH2 base, current address
0005
CH2 base, current word
address
0006 CH3 base, current address
0007 CH3 base, current word ~
~
address
0
I
0008
Common register
0009
Request register
OOOA Single mask register bit
0008 Mode register
OOOC
Clear byte pointer flip-flop
0000 Master clear
OOOE
Clear mask register
OOOF
All mask register bit
0020
ICW1, ICW2, OCW3
U
0021
a...
ICW2, ICW3, ICW4, OCW1
0040 Counter # 0 load
0041 Counter # 1 load
f­
a...
0042 Counter #2 load
0043 Control word
0060 Port A
0061
-
Port 8
a...
a...
0062 Port C
0063 Control word
READ
CHO current address
CHO current word count
CH1 current address
CH1 current word count
CH2 current address
CH2 current word count
CH3 current address
CH3 current word count
Status
x
x
x
x
Temporary register
x
x
IRR, ISR/interrupt level
IMR
Counter #0 read
Counter # 1 read
Counter # 2 read
x
Port A
Port B
Port C
x
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