Control Data 3100 Reference Manual page 130

1/0 MODULE
GENERATES REQUEST
IF NOT TERMINATED
/
READ r
REGISTER OX
WAIT FOR BLOCK CONTROL.
THEN S BUS PRIORITY.
TESTS
STORE BACKWARD?
12---.24 BIT ASSEMBLY?
CHARACTER
TO r
INT= 1 - -
B = 1
6
r+X=s?
END OF
RECORD?
YES
TERMINATE
CHANNEL
INTERRUPT
NO
INT=O
INCREMENT
r BY 1
INCREMENT
r BY 2
DECREMENT
r BY 1
DECREMENT
r BY 2
WRITEr+XIN
ONE REGISTER
(00---.03)
Figure 7 -8. 73 1/0
Operation with Storage
READ r
REGISTER 1X
RELEASE BLOCK
CONTROL AND
SCANNER