IBM 1402 User manual

Systems Reference Library
IBM 1402 Card Read-Punch
This publication covers the IBM 1402 Models 1, 2, 3,4, 5, and 6.
Included are descriptions
of major mechanical units, their functions
and operating controls, and special features
that can be installed to
expand the capabilities of the basic machine.
Additional publications concerning 1402 operation with various
IBM data processing systems are listed in the SRL bibliography for
the specific system. The bibliography lists all technical reference
literature and related materials necessary for planning, program-
nring, installing, and operating the data processing system in any
configuration.
Form Number 1402-03
Form A24-3072-2

This is a major revision of, and obsoletes, A24-3072-1. Changes have been made
throughout
to delete references to Model Nl and to include information about Model 6.
Specifications contained herein are subject
to change from time to time. Any such change
will be reported in subsequent revisions or Technical Newsletters.
Requests for copies
of IBM publications should be made to your IBM representative or to
the IBM branch office serving your locality.
Address comments concerning the contents
of the publication to IBM Corporation,
Product Publications, Department 245, Rochester, Minnesota 55901.
C International Business Machines Corporation 1960, 1961, 1962

CONTENTS
IBM 1402 CARD READ-PUNCH. 5
Introduction • 5
Major Units
of the 1402 5
Read Feed 5
Punch Feed • 5
Stackers • 6
OPERATING CONTROLS AND PROCEDURES • 7
Models
1, 3, 4, 5, and 6. 7
Model2 • 7
Restart Procedures • 8
Reader Errors 9
Punch Errors (1402 Modesll, 3, 4, 5, and 6 Without Punch
Feed Read Special Features) • 10
Punch Errors (1402 Models 1, 3,4,5, and 6 With Punch
Feed Read Special Features) • 11
Card Jam Removal 12
Transport Area • 12
Punch Feed • 13
SPECIAL FEATURES. 15
51-Column Interchangeable Read Feed . 15
Early Card Read 15
Punch-Feed Read (Models 1, 3,4,5, and 6) • 17
Read Punch Release. 17
Column Binary, Read and Punch Column Binary, Binary
Transfer
17
Timing Summary 17

IBM 1402 Card Read-Punch

INTRODUCTION
The IBM 1402 Card Read-Punch provides punched-card
input and
output for several of the IBM data processing
systems.
It is available in six models. Model 1 is used with
Models
A, B, C, E, and F of an IBM 1401 Data Processing
System; Model 2
is used with the IBM 1410, 7010, 7040,
and 7044 Data Processing Systems; Model 3 is used with
the IBM 1460 Data Processing System; Models 4 and 5
are used with the
IBM 1401 Model G Data Processing
System; and Model 6 is used with the IBM 1401 Model H
Data Processing System.
Each model
of the 1402 has a read feed, a punch feed,
and
five card stackers. The stackers are so controlled that
three stackers can serve each feed.
MAJOR UNITS OF THE 1402
Read Feed
The read feed
on Models 1, 2, and 3 can read 800 cards a
minute; the read feed on Models 4, 5, and 6 can read 450
cards a minute. The actual reading speed during an appli-
cation depends upon the processing time required for each
card.
The read feed
is at the right end of the 1402 (Figure 1).
On Models
1, 2, 3,4, and 6, a file feed tray permits the
loading
of approximately 3,000 cards at one time. Small
groups
of cards (200 or fewer) can be placed directly into
the read hopper
by lowering the joggler gate, carefully align-
ing the cards and card weight in feeding position, then rais-
ing the joggler gate
to allow card feeding or runout. Model
5, which does not have the me feed tray and joggler gate,
has a read hopper capacity
of approximately 1,200 cards.
In all other respects. Model 5
is identical to Model 4.
A card is read in three machine cycles. On the first cycle,
the card moves from the read hopper
to the read check
station. During the second cycle, the card passes through
the read check station, where a hole count
is established,
and stops at the read station. On the third cycle, the card
moves through the read
station~ the hole count is proved,
and data read from the card enters the processing unit's
core storage or, in Model 2, the read buffer. In all models
except 2, the card continues past the read station
to the
normal read (NR) stacker unless program-directed to stacker
1 or stacker 2 within 10 milliseconds after the read com-
mand. Model 2 has a separate prestacker station where the
card just read can await stacker selection without a time
limit (Figure 2).
IBM 1402 CARD READ-PUNCH
Joggler
Gate
Figure 1. Read Hopper, Models 1, 2, 3, 4, and 6
The read feed on Model 3 is equipped with an idle con-
trol timer
that turns off the read feed drive motor when-
ever 30 seconds elapse without a read command. The motor
restarts automatically when the next read instruction
is
issued.
Punch Feed
All models of the 1402 have a maximum punching speed
of 250 cards a minute. The actual number of card pro-
cessed depends on the processing time required between
punch commands. The punch hopper, at the left end
of
the 1402, has a capacity of approximately 1,200 cards.
5

Punch
Hopper Punches Punch
Check Select
Stacker
Pres tacker Station
Model 2
Select
Stacker
Read
Check
Read
Hopper
NormaIUUUUUNO~OI --~
Punch Read
~---
Blank
Station
Figure 2. Card Feed Schematic
NP
4
A punch operation requires four machine cycles. The
card moves from the punch hopper
to a blank station on
the first cycle. This blank station
is reserved for the reading
brushes associated with the Punch Feed Read special fea-
ture when that feature is installed on the 1402. During
the second punch cycle, the card passes through the blank
station and stops at the punching station. The card is
punched during the third cycle; a hole count is established,
and the card stops at the punch check station. On the
fourth punch cycle, the card moves through the punch
check station, where the hole count
is proved, then passes
into the normal punch (NP) stacker, unless program
directed into another stacker (see Figure 2).
Models 3, 4, 5, and 6 are equipped with a punch idle
control timer
that turns off the punch motor whenever 30
seconds elapse without a punch command. The punch
motor restarts automatically when the next punch in-
struction
is issued.
Stackers
The
IBM 1402 has five radial stackers (Figure 3), each with
a capacity
of approximately 1000 cards. Should a stacker
become full, the 1402 stops and a stacker light signals the
operator. Cards can be removed from a stacker without
interrupting the operation.
6
8/2
NR
Read
Figure 3. Radial Stackers
Cards from the read feed normally go into the NR
stacker,
but can be directed to stacker 1 or stacker 2 by
the program. Cards from the punch feed can be rerouted
from the NP stacker into stacker 4 or stacker 8 under
program control.
When programming a 1402, note
that cards from both
feeds can be selected to the common 8/2 stacker, but
machine timing considerations make merging operations
impractical on a standard 1402.

Models 1, 3, 4, 5, and 6
The keys, lights, and switches
on Models 1,3,4, 5, and 6
are alike (Figure 4). Several
of the controls are common
to the entire 1402; others are specifically for the reader
or punch portions.
Common Controls
Start Key* is used to initiate machine operation after a
manual, programmed, or automatic stop.
Stop Key*
is used to stop the system. If a program step
is in process, it is completed before operation stops.
Check Reset Key must be pressed
to reset any punch or
read error indication (punch check, reader check, punch
stop, reader stop, transport error, or validity error),
so that
the start key will be effective for resuming operation. The
check reset key
is effective only when the feed unit in
which the error occurred is cleared
of cards.
Power Light is on when power is supplied
to the machine.
Fuse Light,indicates
that something in the 1402 circuitry
caused a signal fuse
to burn out. A customer engineer
should be notified.
Transport Light indicates a card jam in the transport area.
After the card jam is cleared, the light turns off. Any cards
beyond the read brushes in the read feed
(or the punch
check brushes in the punch feed) have been read (or
punched) and checked.
*Interchangeable with the same key on a system console or on
an
IBM 1403 Printer.
PUNCH
OFF
PUNCH
ON
NON PRO
RUN OUT
PUNCH
CHECK
PUNCH
STOP
FUSE
CHIPS
STACKER
Figure 4. Operator Controls, Models 1, 3,4,5, and 6
CHECK
RESET
OPERATING CONTROLS AND PROCEDURES
Stacker Light signals that a stacker is full. When enough
cards are removed
to allow the stacker slide to return
beyond the stacker trip device, the stacker light turns
off. Operations can be resumed
by pressing the start key.
Reader Controls
Load Key is used to start the loading of program instruction
cards in the read feed. Pressing the load key operates
the
read feed until a card has passed the read station. The
read-in area (positions 1-80
of storage) is automatically
cleared, and a word mark is set in address 001.
After the first card is read at the read station, the
program begins
by executing the instruction punched in
the first columns
of the card. Continued operation, in-
cluding further feeding and reading
of program cards,
is under program control and does not require operator
intervention.
When the punch
onloff switch is on, operating the load
key also starts the punch.
Nonprocess Runout Key (NPRO) is used to clear cards from
the read feed. The key
is operable only when the read
hopper and
me feed tray are empty (or manually prevented
from feeding cards), and the joggler gate is closed. In normal
circumstances the last two cards
that enter the NR stacker
have not been read.
Note: The NPRO key should be operated before loading
cards into the read feed for the first time after power has
been turned on.
Reader Stop Light signals a card-feed failure, a card jam,
or a clutch failure.
It also comes on if the NPRO key has
been pressed. The stop light can be turned
off by pressing
the 1402 check reset key after the condition causing
the
stop has been corrected.
POWER
TRANSPORT
VALIDITY
READER
CHECK
READER
STOP
NON PRO
RUN OUT
READER
OFF
READER
ON
7

Reader Check Light turns on if (1) a hole-count error is
corrected during card reading or (2) the read release
time
is exceeded without the issuance of a read command.*
This light can be turned off by performing an NPRO opera-
tion, then pressing the 1402 check reset key. When opera-
tion stops and the reader check light is on, the last card
in the NR stacker has
not been processed and must be re-
entered after the error is corrected.
Validity Light turns on
if an invalid character is detected
during a read operation. The system stops at the end
of
the read. The validity light can be turned off by pressing
the 1402 check reset key.
If the invalid punching in the
card also causes a parity error, the process and storage
lights on the system console also turn on.
When the validity light
is the only 1402 light on when
the stop occurs, the last card in the NR stacker has
not
been processed and must be re-entered after the error has
been corrected.
If the I/O check stop switch on the system
console
is off and a validity error is detected during a read
operation, the validity light turns on
but the operation does
not stop. A reader error indicator is available for program
testing and reset with the I/O check stop switch off.
Note: When the Punch Feed Read special feature
is in-
stalled, the validity light can also indicate invalid punching.
Reader On/OffSwitch controls the read feed of the 1402.
When the switch is off, the read feed is inoperable.
Punch Controls
Nonprocess Runout Key (NPRO) is used to clear the punch
feed
of cards when the hopper is empty. Of the last three
cards in the
NP stacker after a normal nonprocess runout,
the first has
not been checked and the last two have not
been punched. The NPRO key should be operated before
loading cards into the punch feed for the first time after
power has been turned on.
*This is a programming problem. After a program using the
Read Punch Release special feature has been completely
checked, this condition should
not occur.
Model 2
PUNCH
READY
PUNCH
CHECK
CHIPS STACKER POWER
Punch Stop Light signals a card-feed failure, a card jam,
or a clutch failure;
it also comes on if the NPRO key has
been pressed. The light can be turned
off by pressing the
1402 check reset key after the condition causing the stop
has been corrected.
Punch Check Light turns
of if (1) a hole-count error is
detected in the punch feed, (2) either the A-register or the
B-register detects a parity error during a punch operation,
or (3) punch release time
is overextended.*The punch
check light can be turned
off by performing an NPRO
operation, then pressing the 1402 check reset key.
Chips Light turns on and the 1402 stops when the chip box
is full or improperly positioned. The light turns off after
the condition
is corrected. Operation can be resumed by
pressing the start key.
Punch On/OffSwitch controls the punch feed. When
the
switch is off, the punch is inoperable; when on, andall the
interlock circuits in the punch are satisfied, the machine
operates.
Model 2
Figure 5 shows the operating keys and lights for the 1402
Mode12.
Common Controls
Stacker Light indicates a full stacker. Tro reader unit and
the punch unit
both stop when a stacker becomes full.
Fuse Light indicates a blown fuse in the reader or punch
unit. A customer engineer should be notified
of the
occurrence.
Power Light indicates that power is being supplied to the
1402.
Transport Light indicates a card jam in the stacker area.
All card feeding in the 1402 stops until the jam
is removed.
VALIDITY
READER
READY
READER
CHECK
PUNCH
STOP
FUSE TRANSPOR T
READER
STOP
Figure 5. Operator Controls, Model 2
8

Reader Controls
Reader Start Key (initial operation) feeds three cards into
the read feed, mls the reader buffer with the contents
of
the first card, and turns on the reader-ready light. During
an operation, pressing the start key after a reader stop
condition turns on the reader-ready light, and allows cards
to continue feeding under program control. Whenever cards
are removed from the read feed hopper and the end-of-me
key
is not operated, pressing the start key moves the re-
maining two or three cards
to the stacker area. This runout
operation requires
that the joggler gate be closed.
Reader
Sto~ stops the reader and turns off the reader-
ready light.
End-of-File Key causes the end-of-file latch in the channel
to be turn(~d on after data transfer from the last card. The
next read instruction
is interpreted as a NO-OP and reports
the end-of.·me condition
to the channel. This key is back-
lighted.
Whenever the end
.. of-me key is pressed, the card reader
operates in one
of these ways:
1. With four or more cards in the read hopper, all cards
are processed and run into a stacker. Operating the
stop key or processing the last card causes the end-of-
me condition to be reset.
2. With three cards remaining in the feed, a card-read or
card-feed instruction before operation
of the end-of-
me key causes the program to set the not-ready I/O
channel status indicator. Pressing the end-of-me key
and then the start key allows the last three cards
to
be processed and lun into a stacker. Operating the
stop key or processing the last card causes the end-
of-me condition
to be reset.
3. With one, two, or three cards in the read hopper,
pressing theend-of-me key and then the start key
feeds the card or cards, and turns on the reader-
ready light after the first card passes the second
read station. The card or cards are processed and
run into a stacker. Operating the stop key or
processing the last card causes the end-of-me
condition
to be reset.
Reader Ready Light indicates
that the reader is either
operating or ready
to operate under program control.
Validity Ligh! shows that an invalid character has been
detected during a feed operation. The light remains on
until the next feed instruction
is started. During the read
instruction, the invalid character
is transferred to storage
along with valid data.
Reader Stop Light indicates a feed failure or card jam
during a feed operation. When this occurs, the reader
stops and the reader-ready light turns off.
Reader Check Light indicates the detection
of a hole-count
error, parity error, or buffer timing error during a data
transfer operation. The light remains on until the next
feed instruction
is started. During the read instruction,
the data
is transferred from buffer to storage, and the
processing unit turns on a channel indicator for the
program
to test.
Punch Controls
Punch Start Key is used to feed two cards into the punch
feed and turn on the punch-ready light. After a punch
stop condition, pressing the start key turns on the punch-
ready light, and allows punching
to resume under program
control. When the cards have been removed from the punch
feed hopper, pressing the start key moves the three cards
remaining in the punch feed
to the NP stacker. The first
card that enters the
NP stacker is unchecked; the other
two are unpunched.
Punch Stop Key
is used to stop the punch. It turns off the
punch-ready and end-of-me lights.
Punch Ready Light indicates
that the punch is either
operating or ready
to operate under program control.
Punch Stop Light indicates a feed failure or card jam
during a punch operation. When this occurs, the punch
stops and the punch-ready light turns off.
Punch Check Light indicates the detection
of a hole-count
error, parity error, or buffer timing error during a punch
operation.
Chips Light shows that the chip box is full or not in place.
The light goes
off when the condition is corrected. To
resume operation, the reader start key must be pressed.
Restart Procedures
The restart procedures in this publication apply mainly to
Models 1, 3,4, 5, and 6. These models usually require
operator attention when error conditions arise. Procedures
for restarting Model 2 are explained in the SRL publications
for the appropriate system. This model requires a minimum
of operator attention, because most error correction rou-
tines can be programmed.
9

Reader Errors
Errors detected in the read feed cause the reader stop,
reader check, or validity lights
to come on, either singly
or in combination.
Reader Check Light On
1. Remove cards from the read feed hopper.
2. While lifting cards in the me feed to prevent them
from feeding into the lower magazine, run the two
cards
out of the read feed by use of the NPRO key.
3. Press CHECK RESET on the 1402.
4. Remove the last three cards from the NR stacker.
Check and, if necessary, correct the first card. If a
hole-count error has occurred, use a storage scan
operation
to determine the position in error.
S. Place the three cards removed in step 4, then the
cards removed from step 1 into the read feed
hopper.
6. Press START.
Reader Stop Light On
When operation stops because of either a card feed failure
or a card jam, and only the reader stop light is on, cards
in the stackers and beyond the reading brushes in the
read feed have been processed.
If the reader stop light is
on and neither a feed failure nor jam exists, a clutch failure
has probably occurred.
Th e last card in the NR stacker and
any other cards past the reading brushes in the read feed
may
not have been processed.
1. Remove cards from the read hopper.
2. Remove any jammed cards from the read feed (refer
to
"Card Jam Removal" in this publication).
3. While lifting cards in the me feed to prevent them from
feeding into the lower magazine, run any undamaged
cards
out of the read feed by use of the NPRO key.
4. Press CHECK RESET on the 1402.
S. Duplicate any damaged cards.
6. Place in the read hopper any cards
that were in the
read feed between the read check and read stations,
and replace the cards removed from the hopper in
step
1.
7. Press START.
Validity Light On
When this light is on and a feed cycle has occurred in the
read feed, the last card in the NR stacker contains invalid
character. This card has
not been processed. To correct and
refeed the error card, follow the same procedure
as de-
scribed for "Reader Check Light" (except for the storage
scan operation mentioned in step 4).
10
Reader Stop/Reader Check/Validity Lights On
Whenever the reader check or validity light comes on with
the reader stop light, the last card in the NR stacker caused
the error and must be refed. However,
if the cause of these
lights is a card jam between the read station and the stacker,
the cards must be examined
to determine which card was
the last card correctly processed; all cards following
that
card must be refed.
1. Remove cards from the read hopper.
2. Remove any jammed cards from the read feed.
3.
While lifting cards in the file feed to prevent them
from feeding into the lower magazine, run any un-
damaged cards
out of the read feed by use of the
NPROkey.
4. Press CHECK RESET on the 1402.
S. Duplicate any damaged cards.
6. Replace cards in the
read- hopper in this order.
a. The last card stacked in the NR pocket.
b. The cards removed or run
out from the read feed,
in their original order.
c. The cards removed from the hopper.
7. Press START.
Punch Errors (1402 Models
1, 3, 4, S, and 6 Without Punch
Feed Read Special Feature)
Punch Check Light On
1. Remove cards from the punch feed hopper.
2. Run out the three cards in the punch feed.
3. Press CHECK RESET on the 1402.
4 Remove the last four cards from the NP stacker.
S: Visually check the first of these four cards (discard
the other three), and correct,
if necessary. If the B-light
on the system console
is on (indicating a B-register
parity error), perform a storage scan operation, starting
at position 101,
to determine and correct the position
(l01-180) that contains the parity error. Note the 1-
address for restarting after the scan.
6. Replace the cards removed from the punch feed hopper
in step
1. .
7. To resume operation, enter the address of punch opera-
tion code, set the mode switch
to RUN, and press
START. The last punch cycle repeats and information
in the punch storage area
is repunched.
Punch Stop Light On
1. Remove cards from the punch feed hopper.
2. Remove any jammed cards from the punch feed and
run
out any undamaged cards.
3. Press CHECK RESET on the 1402.
4. Discard the last card punched, because the data will be
repunched.
S. Duplicate any damaged cards.

6. Replace the cards removed from the punch feed hopper
in step
1.
7. Press START.
Punch Stop and Punch Check
lights On
If any other light is on with the punch stop light, visually
check the last card in the
NP stacker and correct it if
necessary. In the case of a card jambetween the punch
check station and the stacker, check the last card read
by the punch check brushes and correct,
if necessary.
To resume operation, after clearing any card jams, follow
the same procedure
as described for "Punch Check light
On.n
Punch Errors (1402 Models 1. 3, 4, 52 and 6 With Punch
Feed Read Special Feature)
Punch Cheek
light On
1. Remove cards from the punch feed hopper.
2. Run out the three cards in the punch feed.
3. Press CHECK RESET on the 1402.
4. Remove the last four cards from the NP stacker.
S. Duplicate inte new cards, the prepunched data from
the first two cards.
If the B-light on the system console
is on (indicating a B-register parity error), perform a
storage
s.can operation (starting at position 101) to
determine and correct the position (101-180) that
contains the parity error. Note the I-address for re-
starting after the scan.
6. Place the two duplicated cards and the third and
fourth cards in the punch feed hopper. Replace the
cards removed from the hopper in step
1.
7. Press START RESET on the system console.
8. Enter a restart address
to start proceSSing at the program
instruction
that had previously caused the first card to
be read by the punch feed read brushes. (Reconstruct
internal data,
if neeessary.)
9. Set the mode switch to RUN and press START to
resume operation.
Punch Stop Light On
When only the punch stop light is on and a punch-feed-
read operation has occurred, all cards in the punch feed
between the hopper and the punch check station should
be reprocessed. Cards beyond the punch check station
and in the stackers have been punched and checked. A
card between the punch and the punch check stations
has not been checked; operation should be restarted
so that this card is repunched.
;Note: If neither a feed failure nor a card jam caused the
punch stop light
to turn on, the stop may have been due
to a clutch failure. The last card in the NP stacker should
be checked.
1. Remove cards from the punch feed hopper.
2. Remove any jammed cards from the punch feed, and
run out any undamaged cards.
3. Press CHECK RESET on the 1402.
4. Duplicate, into a new card(s), the prepunched data
in the card (or cards, in the case of a card jam) that
was between the punch and punch check stations when
operation stopped. This card
was punched but not
checked and must be reprocessed.
S. Place the duplicated card(s), and all other cards removed
from the punch feed (between the hopper and the punch
station), into the punch feed hopper in their original
sequence.
6. Replace the cards removed from the hopper in step
1.
7. Press START RESET on the system console.
8. Enter a restart address
to start processing at the program
instruction that had previously caused the first card
(duplicated in step 4)
to be read by the punch feed
read brushes. (Reconstruct internal data,
if necessary.)
9. Set the mode switch to RUN and press START to
resume operation.
Validity
light On
When only the validity light is on and a punch-feed-read
operation has occurred in the punch feed, the card just
read at the punch feed read station contains an invalid
character.
1. Remove cards from the punch hopper.
2. Run out the three cards in the punch feed.
3. Press CHECK RESET on the 1402.
4. Remove the last three cards from the NP stacker.
S. Visually check the first of these three cards. (This card
had been punched
but not checked when the error
occurred.) Correct this card,
if necessary, then replace
it in the stacker.
6. Correct the validity error in the second card (the error
card).
7. Place the second and third cards in the punch hopper,
and replace the cards removed from the hopper in
step 1.
8. Press START RESET on the system console.
9. Enter a restart address that will start processing at the
second card
to be read by the punch feed read brushes.
10. Set the mode switch to RUN and press START to
resume operation.
Validity and Punch Check Lights On
If the validity and punch check lights are both on, two or
more error conditions have been detected in the punch
feed. Follow the same restart procedure
as described for
11

"Punch Check Light On." Correct the invalid character in
the card just read by the punch feed read brushes (third
card removed from the
NP stacker in step 4).
Punch Stop/Punch Check/Validity Lights On
If any other light is on with the punch stop light, and a
punch-feed-read operation has occurred, two or more error
conditions have been detected in the punch feed. To re-
sume operation, after clearing any card jams, follow the
same procedure
as described for "Punch Check Light On."
Note: If cards have jammed between the punch check
station and the stacker, the last card read by the punch
check brushes should be the first card reprocessed. Du-
plicate the prepunched data from this card into a new
card. Also duplicate into new cards the prepunched data
in all other cards
that have passed the punch station. Place
the duplicated cards and the other cards removed from the
punch feed into the punch feed hopper in their original
sequence.
Punch
Check
Brushes
Figure 6. Access to Transport Area
12
CARD JAM REMOVAL
Most card jams in the IBM 1402 are caused by rubber bands,
staples, and paper clips run in with the cards; cards with
bent corners or frayed edges; missing card weights; and
improperly-positioned brusheso
By following certain guides in the removal of card jams,
injury
to the operator and damage to the machine can be
avoided. However, because
of the varying circumstances
involved in removing card jams, step-by-step procedures
cannot be given.
Transport Area
When confronted with a jamin the transport area, first
turn
off the power to the 1402 reader and punch units, then
raise the
me feed tray and open the top covers of the 1402
(Figure 6). The jammed cards should be removed as nearly
intact
as possible, to facilitate their replacement. A hand
feed wheel, inside the front cover
of the 1402, allows the
operator
to slowly advance the read feed and transport
(Figure 7).
Read
Brushes
File Feed
Tray (Raised)
Read check
Brushes

Punch
Feed
Manual.,A
Trip
Lever
Punch Feed Crank
Figure 7. Front View (Covers Open)
~rote: Should it be necessary to remove the read check,
read, punch check, or punch feed reading brushes, care
should be taken
to avoid contact between the reading
surface of the brushes and any other part of the 1402.
Such contact may damage the individual brushes or, with
the main system power still on, blow a fuse. Replacement
of the brushes requires equal care. The hand feed wheel
should be rotated
as the read feed brushes are reinserted.
After removing the jam, make sure
that all latching pins
are snapped into place before running cards out, entering
new cards, and resuming operation. Repetitive reader or
punch check conditions, immediately after a brush block
has been replaced and operation restarted, may indicate
damaged or short-circuited brushes.
Punch Feed
If a jam should occur in the punch feed, first turn off power
to the 1402 reader and punch units, then open the top
Hand Feed Wheel
covers of the 1402, and try to remove the jam from the top.
If this is not possible, trip the manual clutch lever behind
the front cover, crank the feed
to a setting between 3350
and 3500, and remove the punch die (Figure 8).
Punch Die Removal
The punch die can be either
of two types: side-locking
or top-locking. The side-locking die is characterized
by a
pair
of handles on the underside of the die assembly; the
top-locking die has one handle, shaped like an inverted T.
Before the punch die can be removed, the plastic chip
funnel under the die must be taken
out and, on machines
with a lowering frame, the lowering-frame knob must be
rotated. To remove the side-locking die, grasp the two
handles in one hand and squeeze them together. This
releases the die from its attachment
to the punch frame.
With the die removed, reach into the space vacated
by the
die assembly and remove any cards
that have jammed there.
The top-locking die is removed in the same manner, only
13

Figure 8. Punch Die (Top-Locking)
14
Top- Lock i ng
Die Handle
Chip Funnel
the handle (inverted T) is turned instead of squeezed. (The
ejection trigger can be used
to free the top-locking die
after the handle has been loosened.)
Punch Die Replacement
When all cards and card fragments have been removed from
the punch feed, the die can be replaced. The side-locking
die requires squeezing the handles together, pushing the
die into place, then spreading the handles apart until the
die snaps into place.
If the die is not properly seated, the
machine will
not run. The top-locking die is reinstalled by
pushing it into place, then tightening the handle. Caution
should be used when testing the replacement of the die.
Carefully pull down on the handle; if the die is properly
seated,
it will not come out when the handle is pulled.
After replacing the die, raise the lowering frame.
Note: Make sure all covers are closed. Interlock switches
prevent machine operation when any cover
is open.

51-Column Interchangeable Read Feed
The 51-Column Interchangeable Read Feed (including me
feed) permits feeding either 51-column cards or 80-column
cards into the read feed
of the IBM 1402 Models 1, 2, 3, 4,
and 6. Conversion
of 51-column cards into 80-column
cards prior
to entry into the data processing system is not
necessary.
During 51-column card operations, the 1402 performs
all normal functions except selection
of cards into the
8/2 stacker.
The
me: feed and the NR and 1 stackers must be
positioned for 51-column cards
by the operator.
Reading and Storage Considerations
Information
is read from the 51-column cards by reading
brushes
15 through 65. A factor of 14 relates the card
column to its corresponding position in core storage.
When the NR stacker is adjusted for 51-column operation,
storage
of information is automatically regulated to read
into storage addresses 015 through 065. Storage address
014 is used for cycle timing; all other positions are un-
altered.
In
Mod(~ls 1, 2, 3, 4, and 6, the loading of instructions
from 51-column cards
is also automatically regulated
once the NR stacker has been adjusted. Operation
of the
load key automatically causes a word mark
to be entered
into storage position 015, word marks
to be cleared from
pOSitions 016-065, and the I-register to be loaded with
storage address 015. (The factor
of 14 must be added to
the standard read-in area addresses as referenced by the self-
loading program cards.)
Note: The operator should be aware
of these precautions
concerning 51-column card operations:
1. Left-scored 51-column cards must not contain punches
in columns equivalent
to columns 28 and 29 of an 80-
column card. These columns are at the edge of a 51-
column card, and misfeeding may result
if they are
punched. The first punchable position
of a left-scored
51-column card corresponds
to column 30 of an 80-
column card.
2. When changing from 51-column to 80-column operation,
the operator should run a few 80-column cards through
the read feed to ensure that the card transport area is
clear.
SPECIAL FEATURES
Setup Procedures, File Feed and Stackers
The
me feed and stackers NR (Rl) and 1 (R2) are set up
for 51-column card operations
as follows:
1. Position the hopper sideplates in the hopper, and fasten
the sideplates
to the hopper with the knurled thumb-
screws.
Be careful not to interfere with the bedplate
springs.
2. Place the me feed tray guides on the me feed tray.
3. Reach into each stacker (Figure 9),
NR and 1, and using
the finger hole in the stacker guides, .pull each guide
forward and down until
it latches.
4. Raise the small cover just above the NR and 1 stackers
and partially lower the pivot plate assemblies. Slide each
assembly
to the rear of its stacker until it latches, then
pivot the assembly all the way down.
5. Place 51-column cards in the me feed tray and begin
operations.
Note: When reverting to standard 80-column card opera-
tion, follow the setup procedures in reverse sequence.
Handle and store the file feed tray guides and the hopper
sideplates carefully.
Early Card Read
The Early Card Read special feature
is available only for the
IBM 1402 Modell; it is a standard feature of Models 3, 4,
5, and 6.
Without Early Card Read, a standard
Modell can attain
its maximum reading rate
of 800 cards per minute only
when successive read cycles occur every 75 milliseconds, and
the application does
not require more than 10 milliseconds
of each cycle for process time (the time between reading a
card and issuing the next read instruction). For processing
routines that require between 10 and 85 milliseconds of
process time, one complete read cycle is skipped and the
maximum reading rate
is 400 cards per minute.
With Early Card Read, the effect
of increased processing
time is minimized. Additional clutch points (points at which
a new read cycle can begin) are provided at 25 millisecond
intervals. Consequently, a processing routine
of 11 milli-
seconds would cause only one-third (25 ms)
of a normal
read cycle
to be skipped, and a higher reading rate, 600
cards per minute, would be attained (Figures 10 and 11).
15

Figure 9. Stacker Adjustment, 51-Column Cards
Standard
Machine
I·
Clutch
Point
4~
Read Start Time
21 ms
Read Cycle
75 ms
Card Reading Time
44 ms
----------------
---------------------------------
Early Card
Read Special
Feature
Additional Additional
Clutch Points Clutch Points
, T
~25m'l
I I
Read Start Time Card Reading Time
21 ms
I
44 ms
I
I I
I I
Note: Read start time is available as process time
if
the Punch Release special feature is installed.
Figure 10. Read Cycle Timing
16
·1·
Clutch
Point
.~
Process
Time
10 ms
II
II
/;
II
"
1/
//
II
I
I
II
II
Ii
II
II
II
I,
"
Ii
1/
1/
II
1/
//
II
/1
- ~===~
----
75 ms
Process time over 10 ms
an d under 85 ms causes one read
cy cle to be skipped; speed drops to 400 cpm.
·1
Clutch
Point
85 ms ---------------1
---------
------------------
Process
Time
10 ms
35 ms
Process time over 10 ms
and under 35 ms causes
1/3 read cycle to be
skipped; speed drops to
600 cpm.
Addit
ional Additional
Clutc
h Points Clutch Points
, ,
L 25 ms ---.-J
I I
I I
I I
I I I

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 I44.33 ms 1 44.33 ms 144.33 ms
Read Card
1-4---Clutch Impulse Time----_.
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

240 ms
37 ms 181 ms
I 22
ms
Punch Start Time
Punching (Punch Only Operation) I Processing
Time
37 ms 184 ms
19 ms
Punch Start Time
Punching (PFR
Op
eration) Processing
Time
Figure 13. Punch Timing
18

A24-3072-2
International Business Machines Corporation
Data Processing Division
112 East Post Road, White Plains, N.Y.106Ot
[USA Only]
IBM World Trade Corporation
821 United Nations Plaza, New York, New York 10017
[ International]