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CD
Bus Out Control
r - -
A
Address Out
T3
; - - -
ecycle Reset OR
R
F B=K
'----
A
OR
r - - A
-
L . -
A
-
-
Se lect in
Status in
;;:-
r - -
Not 1401 Mode
' - - -
A
OR
Address in
Not Op Out Signal
7
r--
'-r-;;:-
r - -
Address Out
~
1.1401 Reset Of Burst Mode
2. Blocks Norma I Reset to Se lect Out
Figure 5-12.
Select Out
1402 Read Operation
With a 1402 operating with a 1401 or a
1460 system, the programmer has 10 mil-
liseconds after a read-a-card instruc-
tion to give a stacker select instruc-
tion.
The card being read then feeds
past the read brushes and into the
stacker selected.
When a 1402 is operating on
System/360, Model 30, a read command
causes the buffer to transmit data to
the CPU, but no card movement takes
place.
TO make the 1402 on a 2030 act like a
1402 on a 1401, a circuit is added to
Select Out
'OR
Select Out
1
__ FL __
~
OR
-
cause a provisional feed 6 milliseconds
after a read command is given. Basical-
ly this circuit accomplishes this: 6
milliseconds after the data transfer of
a read command starts, an automatic feed
cycle occurs and the card just read
selects to the normal pocket.
If, dur-
ing the
6-
millisecond timeout period, a
1401 or 1460 stacker select command is
sensed, a feed and stacker select com-
mand is issued to the 1402.
This feed
command causes the card to feed immedi-
ately and stacker select and also pre-
vents the provisional feed from occur-
ring (Figure 5-13).
5-21
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