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1/0 MODULE
GENERATES REQUEST
!
READ r*
FROM
REGISTER OX
TERMINATE
CHANNEL
INT
=
1
WAIT FOR BLOCK CONTROL.
THEN S BUS PRIORITY.
INT= 0
INTERRUPT
WRITE r
IN
REGISTER OX
READ
5
FROM
REGISTER 1X
RELEASE BLOCK
CONTROL AND
SCANNER
INPUT OR OUTPUT ONE
t-----.;~
CHARACTER OR WORD
TOIFROM REGISTER A
EXIT
RNI AT
P+3
.. rAND
5
HAVE NO MEANING AS
ADDRESSES FOR OPERATIONS
WITH REGISTER A.
Figure 7 -15. 76 I/O Operation with A
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