Punch-Feed Read (Models 1, 3,4,5, And 6); Read Punch Release; Column Binary, Read And Punch Column Binary, Binary; Transfer - IBM 1402 Manual

Maximun Milliseconds Cards per Cards per
Processing Between Minute
Minute
Time Card Read
(1402
without
(1402
with
Required Commands Early Card
Early Card
(Milliseconds) Read Feature) Read Feature)
10 75 800 800
35 100 400 600
60 125 400 480
85 150 400 400
110 175 266 342
135 200 266 300
160
225
266 266
185 250 200 240
Figure 11. Effect of Processing Time on Reading Speed
Punch Feed Read (Models 1,3,4, 5, and
6)
In some applications, it is desirable to read information
into the system, then calculate and punch the results in
the same card from which the input data was read. The
Punch Feed Read special feature permits reading a card at
the punch-feed-read station while the card ahead of it is
being punched. For this
operation~
a special set of SO
reading brushes is added to the 1402 punch feed, one
station ahead of the punch station (the blank station in
Figure 2). The d-character "R" specifies that the card
is to be read from the punch side of the 1402.
The normal read area in Models 1, 3, 4, 5, and 6 (storage
locations 001-0S0) receives the information from the Punch
Feed Read in the same manner as from the read feed. Val-
idity and hole-count checks are made on each card column
read from the punch-feed-read brushes. (MLP card codes
Gause validity errors if read by the punch-feed-read brushes
on an otherwise standard 1402.)
Punching operations with Punch Feed Read are the
same as for a basic 1402. Storage positions 101-IS0 are
specified as the punch area in systems using Models 1, 3,
4, 5, and 6, and a hole-count check is made at the punch
check brushes. The hole-count check of prepunched data
is begun at the punch read
stati~)ll
and
IS
completed at the
punch check station after punching has occurred.
Punching in prepunched columns is acceptable, provided
that (1) the resultant character is valid, and (2) the punches
read at the punch-feed-read station are not repeated. An X,
for example, could be punched in a card column that
already contains a 2, but punching a K (X and 2), if either
an X or a 2 was already in the card, would result in a hole-
count check..
!~ead
Punch Release
The Read Punch Release special feature is available for those
IBM data processing systems using the 1402 Models 1, 3,4,
5, and 6. With this feature, card movement in the read feed
can be initiated by either the normal read instruction or the
start read feed (SRF) instruction. When the SRF instruction
is used, 21 milliseconds of read start time is made available
to the processing unit.
Card movement in the punch feed can be initiated by
either the normal punch instruction or the SRF instruc-
tion. Use of the SRF instruction makes 37 milliseconds of
punch start time available to the processing unit.
The programmer should note that failure to give the
read instruction within 21 milliseconds after an SRF com-
mand will result in a reader check. Similarly, failure to
issue the punch instruction within 37 milliseconds after an
SRF command will cause a punch check.
Column Binary, Read and Punch Colunin Binary, Binary
Transfer
Column Binary (IBM 1401 Models B, C, E, and F systems),
Read and Punch Column Binary (IBM 1410 and 7010 sys-
terns), and Binary Transfer (IBM 1460 systems) allow the
1402 Models 1, 2, and 3 to read and punch any combina-
tion of punches in a given card column. Validity checking
by the 1402 is suspended during binary operations.
Timing Summary
Read cycle timings for Models 1, 2, and 3 are shown in
Figures 10 and 11, under the discussion of the Early Card
Read special feature. Figure 12 shows the read cycle timing
and reading speeds in cards a minute for Models 4, 5, and 6.
The punch timing chart for all models in shown in Figure
13.
Clutch Points
33 ms 78 ms
22
ms
I
44.33 ms 1 44.33 ms 144.33 ms
Read Card 1-4---Clutch Impulse T i m e - - - - _ .
Access Reading
J
Time Time
f-+-- 133
ms
(450
cpm)
1 - 4 - - -
177
ms
(338
cpm) - - - - " ' " '
. . . - - - - - - 222 ms (270 cpm) _ _ _ _ _ _
~
...... - - - - - - 266 ms (225 cpm)
--------~
Figure 12. Read Cycle Timing Chart, Models 4,5, and 6
17