Control Data 1700 Maintenance Manual page 22

various controllers to inform the controller that the information being sent is
a Function Code, not a data word. The logical
"I"
output of 3-B17-l6 is used
within the Common Synchronizer for an Equipment Function, which will be discussed
later.
The logical
IIp
output of 5-B14-24 is sent to station 4, informing the controller
that it is to perform the Function specified by the incoming code. The logical
Ill" outputs of 5-B14-22 and 6 and the logical "0" output of 5-B14-7 are used
within the Common Synchronizer for Input operations from station 4 and have no
significance during output operations.
Data lines from the A Register fan-out pass directly through the Common
Synchronizer and go to the four controllers without requiring any gating. The
data line from AOO enters 3-B16-3 where it fans out to become five signals,
one for each controller and one to be used within the synchronizer. The data
lines from AOl, A02, A03, A04, A06, and A07 pass through the TH module and go
out to the appropriate controllers. The data line from A05 passes through the
202 module, page 5, and goes out to the four controllers. The fan-out of A06
is insufficient in the TH module, page 9. The remainder of this fan-out is
through the 201 module, page 3.
Upon receipt of the function command from the Common Synchronizer, the designated
controller will either Reply or Reject. If it sends a Reply, it means at least
one function was performed. The Reply will be treated in the same manner as
previously discussed under the topic Read Data. Upon receipt of the Reply, the
computer wi 11 :
(1) start the computer timing chain (page 7) at time 200.
(2) clear the Output FF (page 75), causing the Write signal to drop.
1-11 Rev. A