Canon A-200 series Service Manual page 62

I/O
WRITE
READ
Address
0080
x
x
OJ
Q)
0081 cr: DMA CH2 upper address for FDD OMA C H2 upper address for FOO
<t:
0082
~
OMA CH3 upper address
DMA CH3 upper address
0
0083 DMA CH 1 upper address
DMA CH1 upper address
,.
OOAO -
-en
NMI mask register
x
~Q)
OOAF
zcr:
0378
cr:
Printer data Echo data
llJ
I ­
0379
z
Printer status
cr:
037A
a..
Printer output control Printer status
0384 68B45 index register
x
0385
c
68B45 Data register
68B45 data register
0"0
.....
om
03B8
~S
CRT control port
x
038A
x
CRT status port
03D4 68845 index register
x
03D5 68845 data register
68845 data register
0308 Mode control register
x
..... "0
0 .....
_m
0309
0 0
Color select register
x
Oil)
03DA
x
Status resister
0308 Reset light pen latch
x
03DC
Set light pen latch
x
03FO FDD control register
x
0
03F4
0 Command register Status register
LL
03F5 Data register Data register
03F8 Transmitter holding register Receiver buffer
03F9 Interrupt 'enable
03FA Interrupt
03FB Line control ~
<t:
03FC :::> M adem control
03FD Line status
03FE
Modem status
03FF
x x
59