IBM RAMAC 305 User manual

RAMAC®305 REFERENCE SUMMARY
The information contained in this summary is intended as an aid for the more experienced
programmer and operator. It is condensed from the IBM RAMAC 305 Reference Manual
(Form No. A26-3502). Reference should be made to that manual when more complete
information is required.
RAMAC 305
© 1957, 1958, 1959, 1960 by International Business Machines Corporation

305 PROCESS DRUM TRACKS
305
PROCES
DRUM
Additional printer output track: T
Additional processing tracks: U / . #
Paper Tape Input track: $
VALID TRACK ADDRESSES
FROM
Accumulator
Add
Subtract
Read out and reset M
Read out L
Multiplicand V
Multiplier *
Input Track K
Output Track
(Standard Machine) S
Disk Memory R99
Address Register *
Character Selector
Inquiry Track Q
Magnetic Core
Unit
-99
Punch Output Track
S
Printer Output Track
(Special Feature) T
Paper Tape Input
(Special Feature) $
*Invalid Address
TO
L
M
V99
N99
K
S
R99
J
-99
Q
1299
S
T
$
INVALID TRANSFER INSTRUCTIONS
M to R
R to J
J to Any Track
Systems Summary
COMPARING EXCEPTIONS
The following chart illustrates both valid and invalid track
addresses for compare, field compare, and combined compare.
*Yes, if TO =V99 and NO. of CHAR. =00
NOTE: During field compare, TO address determines field com-
pare selectors affected.
MULTIPLICA TION
Basic Rules of Multiplication
Maximum number digits in multiplier cannot exceed 11 *.
Maximum number digits in multiplicand cannot exceed 9.
Maximum number digits in product cannot exceed 20.
Product is developed in accumulators 0 and 1.
Location of Product
Units position of product is 8 plus number of digits in multi-
plier, minus number of positions to be dropped from product.
*One low-order position of the product will be lost for each
digit in the multiplier beyond 11.
Instruction Explanation
1. Position multiplicand on multiplicand track.
xxxV99zz xxx -Track and units position of multiplicand.
zz - Number of digits in multiplicand.
2. Execute automatic multiplication.
yyyN99zz
yyy -Track and units position of multiplier.
zz - Number of digits in multiplier.
Half Adjustment
The position to half-adjust can be determined by using the
following formula:
(09) -( the number of decimals to be dropped =position to
half-adjust.
NOTE: Accumulators 0 and 1 should be reset prior to initiating
automatic multiplication.
Speed
The following formula may be used to compute the time re-
quired for multiplication (includes 30 ms for loading multi-
plicand).
60 + 10 (n - 1)= time in milliseconds.
n =number of multiplier digits.
REFERENCE SUMMARY 3

AUTOMATIC DIVISION
Basic Rules of Division
Maximum number digits in dividend cannot exceed 19.
Maximum number digits in divisor cannot exceed
9.
Maximum number digits in quotient cannot exceed 19.
Maximum number digits' in divisor plus maximum number
digits in quotient cannot exceed 20.
Location of Quotient
Units position of quotient is in 119.
Location of Remainder
Units position of remainder in L08 minus number of digits in
excess of 11.
(Number of digits in remainder equal number
of digits in divisor.)
Instruction Explanation
1. Position dividend in accumulators 0 and 1.
xxxLyyzzb5 xxx -Track and units position of dividend.
yy -Maximum whole number digits in quo-
tient plus 8. (Cannot exceed 19.) Maxi-
mum whole number digits in quotient is
maximum digits in dividend minus mini-
mum digits in divisor plus one.
zz - Number of digits in dividend.
2. Position divisor on multiplicand track.
xxxV99yy
xxx- Track and units position of divisor.
yy - Number of digits in divisor. (Including
added zeros.)
If number of digits of
quotient exceeds 11, zeros must be added
to right of divisor equal to number in
excess of
11 before execution of this
instruction.
3. Execute automatic division.
L09P99xx xx -Twice the number of digits in quotient.
Half Adjustment
Increase the number of digits in quotient by one in instruction
(3) above, add 5 to 119 after execution of instruction, and
read quotient from position L18. Remainder is also positioned
one position to the left.
(Do not exceed basic rules of divi-
sion.)
NOTE: If number of digits in quotient desired exceeds maxi-
mum whole number
of digits, then additional digits are decimal
figures.
Speed
The following formula may be used to compute the time re-
quired for division (includes 30 ms for positioning dividend
plus 30 ms for loading divisor).
100 + 20 (n - 1) =time in milliseconds.
n =number
of quotient digits.
4 IBM RAMAC 305
OPERATING SPEEDS
370 Printer Output
80 positions
60 positions
40 positions
20 positions
Punch Output
Card Feed Input
Typewriter Output
(29 LPM)
(36.5 LPM)
(50 LPM)
(84 LPM)
( 100 CPM max.)
(125 CPM max.)
2050 ms/line
1640 ms/line
1200 ms/line
720 ms/line
600 ms/card
4so ms/card
Automatic Typing
Manual Typing (average)
Tabulations (average)
Carriage Returns (average)
100 ms/ character
200 ms/ character
300 ms/tab
1000 ms/ return
Disk Storage Timing
Seek time disk to disk:
SOo ms/ max. 600 ms/ avg. 400 ms/ min.
Seek time track to track, same disk:
250 ms/max 175 ms/avg. 100 ms/min.
Seek time record-to-record, same track:
50 ms
Transfer disk to drum track:
so ms/max. 55 ms/avg. 30 ms/min.
Transfer drum to disk:
130 ms/max. 105 ms/avg. 80 ms/min.
Other Operating Speeds
Track-to-track transfer on drum 30 ms
Control panel test additional 20 ms
Record advance additional 30 ms
Skip-to-record additional 30 ms
Addressing Address Register additional 20 ms
Cycle Delay additional 30 ms
NOTE: If Program Exit Overlap is installed, certain instruc-
tions which normally require
50 ms for execution may be com-
pleted in 30 ms.
FEATURE SUMMARY
Features of the RAMAC 305 are summarized below. For each
feature, the table indicates the number
of units included in the
standard machine, the units in which each optional addition may
be made and the maximum available capacity.
305 FEATURES
Standard Increment Maximum
Character selectors 3* 3 6
Distributors 100 20 120
Selectors 10
,10
40
323 FEATURES
Standard Increment Maximum
Co-Selectors
()
4**
20**
Pilot Selectors 0
5t
lOt
Digit Selector 1 2
Offset Stacker 0 1 1
DPBC positions 20
10
80
370
FEATURES Standard Increment Maximum
Co-Selectors
4** 4**
12**
Pilot Selectors 0
5t
lOt
Skip Stops 6 5 11
*One 4S-position character selector standard.
**5-position
t2-position

CONSOLE READING AID
READ, WRITE, AND ALTER SUMMARY
The following diagrams show the sequence of operations with
the test lock On or Off.
DIGIT ZONES CHAR
NO
DIGIT
1
2
3
4
5
6
7
8
9
11
12
x 0
• -
• • &
• 0
• • A
• J
• /
1
• • B
• K
• S
2
• • c
• L
• T
3
• • D
• M
• U
4
• • E
• N
• V
5
• • F
• 0
• W
6
• • G
• p
• X
7
• • H
• Q
• y
8
• • I
• R
• Z
9
• •
• $
• #
• •
I!
• *
• %
@
X 0
CONSOLE READING AID
The Console Reading Aid
( On Left) is designed to help the
operator decipher the binory coded
instruction lights more quickly and
easi Iy. It should be used in the
following manner:
I. Mentally arrive at the sum
of the numeric lights glowing.
For example:
1 2 4 8
0.00
.0.0
••• 0
oooe
2. Refer to the chart for the
digit which corresponds to
this sum. {left hand column}
3. Find the proper zone lights
opposite this digit.
4. Follow across to the number,
letter, or special character
represented by these lights.
In the following example; the X, 0, 2,
and 4 lights are glowing:
XOl248
.. ~
6
Because the numeric lights total 6, the
zone lights opposite the digit 6 on the
chart should be checked for a matching
condition. The matching zone pattern {an
X and 0 in this example} should then be
followed across to the character repre-
sented, which in this case is the letter F.
Test Lock On
1st
~
to Q
From
[;J
2nd
~
On Q
3rd IWrite I
From
Q To
TesT Lock Off
1st B
To Q From
[;J
2nd
8 Parity
On Q
3rd IWrite I
From Q
To
TEST LOCK FUNCTIONS
The following is a resume of console keyboard operations with
the Test Lock ON and with it OFF.
Test Lock
ON OFF
Make disk file inquiries during processing ____________ No Yes
Make disk file inquiries
when not processing ________ No Yes
Make
drum track inquiries during processing ________ No No
Make drum track inquiries when not processing ____ yes Yes
Alter a record in the disk storage file
____________________ No No
Alter a drum track record ________________________________________ Yes No
Read from drum track "M" (clear accumulators) Yes No
Correct parity errors ________________________________________________ No Yes
NOTE: Any inquiries directed to the disk storage file during
processing will be replied to only as provided for in the program.
RAMAC CYCLE CHART
Delay
DELAY
Regenerated
Impulses
Emit.Used
to Return to
Stored Prog
or Select
Access Arm
EXI T
NOTE: Dual
Access Select Hubs, accept only during an exit cycle
RAMAC Cycles Timing Chart
REFERENCE SUMMARY 5

Console Operating Procedures
\
START-STOP PROCEDURES
Starting the Machine After a
Power-Off Condition
1. Depress the Power-on key at the console. After the con-
sole
lights have turned on, depress the Reset key.
2. Depress
the printer Start key.
3.
Hold the punch Start key down until cards stop feeding
and the Ready light is on.
4. Depress any Control Impulse buttons that are required
by the program.
5. Place the Control Selector switch to the desired mode
of operation.
6. Place the desired data or program load cards in the
reader hopper.
7. If a new program is to be loaded, depress the Program
Load button. If the program is already in the machine,
depress the reader Start key.
Restarting the Same Job
To restart the same job, place cards in the feed and de-
press the reader start key.
Starting or Stopping at a Specific Program Step
To Start:
1. Set the Program Selector switches to the desired program
step.
2. Set
the Control Selector switch to the desired mode of
operation-RUN, SINGLE OPERATION, etc.
3. Depress
the Program Set key.
4. Depress
Program Start.
To Stop:
1. Set the Program Selector switches to the desired program
step.
2. Set the Control Selector switch to CONTROL STOP.
INQUIRIES
Inquiries-File Information
When Not Processing
1. The Test Lock must be off.
2.
The machine must be reset-depress Reset.
3. Depress the desired Format key.
4. Key
in the desired five-digit address.
Inquiries-File Information During Processing
ITI0ff:
I. Test Lock must be off.
2.
Control Selector switch should be set to RUN.
3. Depress the desired Format key.
4.
Inquire light comes on immediately.
5. Key in the record address.
ITI0n:
I. The Test Lock must be off.
2.
The Control Selector switch should be set to RUN.
3. Depress the desired Format key.
6 IBM RAMAC 305
4. When the program reaches the step which tests the In-
quiry IN hub, the Inquiry light will turn on and the
program will stop. (The Cycle lights will show contin-
uous Delay and Exit cycles.)
5.
When the Inquiry light turns on, key in the five-digit
address.
Inquiries-Drum Information
When Not Processing
1. The Test Lock may be either on or off.
2.
The Control Selector switch is set on RUN.
3. Depress the Read key (read to "Q") .
4. Depress the desired character key on the keyboard.
ALTERATIONS TO DRUM TRACKS
Altering Part of the Information
on a Drum Track
I. The Test Lock must be on.
2. Depress the Read key.
3. Select
the proper track by depressing the corresponding
character key.
4.
Depress the Alter key to place the keyboard in a condi-
tion to type on the Q track.
5.
Duplicate the track information on the typewriter track
by
holding down the DUP key. Duplicate up to the posi-
tion to be changed.
6. Type the new information.
7. Depress the Clear key after all alterations have been
completed.
8. Depress the Write key.
9.
Depress any desired track key except R.
Altering a Complete Drum Track
I. The Test Lock must be on.
2. Clear the Q track. This may be accomplished by depress-
ing the Read key, the Space bar, and the Clear key in
this order.
3. Depress the Alter key to place the keyboard in a condi-
tion to type on the Q track.
4.
Type the desired information.
5. Depress the Clear key if typing less than 100 characters.
6. Depress the Write key.
7. Select
the desired track by depressing the corresponding
character key.
TESTING PROCEDURES
Testing Typewriter Control Panel Formats
1. Inquiry format
a. Depress the Reset key.
b. Turn the selector control switch to FORMAT TEST.
c. Depress the appropriate Format key (1, 2, or 3) .
d. Key in the desired file address.
e.
Depress the Program Start key one time for each cycle
of operation on the typewriter control panel program.

2. Document-printing format
a. Reset the process unit.
b. The test record must be on the typewriter track.
c. Turn the Selector Control switch to FORMAT TEST.
d. Depress the Program Start key one time for each cycle
of operation on the typewriter control panel program.
Program Testing
Method I executes a program, one step at a time; method
2 executes several program steps or a complete routine before
stopping.
METHOD 1
1. The Test Lock should be off.
2.
The File Interlock switch on the process control panel
should not be plugged. By leaving this switch unplugged,
it is impossible to destroy a file record.
3. Turn the program selector switches so that they corre-
spond to the first program that is to be executed, and
place the control selector on CONTROL STOP.
4. Place program load cards in the machine, and proceed
through a normal program load routine.
5. After the processing unit has stopped on the first pro-
gram, turn the Control Selector switch to SINGLE OPERA-
TION.
6. When the Program Start key is depressed, the machine
will perform one program step at a time.
7. If the operator wishes to examine a track at any time,
it is necessary only to depress the Keyboard Read key,
and then type out the desired track by depressing the
corresponding
character key.
NOTE: Because the File Interlock switch is not jack-plugged
during this procedure, each time the program attempts to
write onto the disk storage, the machine will stop and the
File light will glow. Operation may be resumed by depress-
ing the Check Reset key, setting the program selector switches
to. the next program step, depressing Program Set, and then
Program Start.
METHOD 2
1. The Test Lock should be off.
2.
The File Interlock switch on the process control panel
should not be plugged. By leaving this switch unplugged,
it is impossible to destroy a file record.
3. Turn the program selector switches so that they corre-
spond to the first program that is to be executed, and
place the control selector on CONTROL STOP.
4. After the processing unit has stopped on the initial step
of the first routine, place the program selector on the
first step of the second routine.
5. At this point, the operator can investigate the tracks
that have been affected to determine if everything is in
order. This may be accomplished by depressing the Key-
board Read key and selecting the proper track.
NOTE: Because the File Interlock switch is not jackplugged
during this procedure, each time the program attempts to
write onto the disk storage, the machine will stop and the
File light will glow. Operation may be resumed by depressing
the Check Reset key, setting the program selector switches to
the next program step, depressing Program Set, and then
Program Start.
Track Clearing
Clearing a track to blanks or the accumulator track to zero
can be accomplished by using the console keyboard as follows:
1.
Turn the Test Lock on.
2. Depress Read and Space. This writes blanks on the Q
track. The Q track can now be used to blank out other
tracks (e.g., track W) by depressing Write and the ap-
propriate character key (W in this case) .
To reset the accumulator track, depress Read and M.
REFERENCE SUMMARY 7

Error Correction Procedures
PROCESSING ERRORS
Parity Check Stop
Console Indication:
1. Processing stops (Red Stop light on) .
2.
Parity light on.
Cause:
Improper character transfer within the processing unit.
Restart PTOcedure:
1. If the parity check occurred on the INSTRUCTION cycle,
the machine will stop with the INSTRUCTION CYCLE light
on. The operator may attempt the transfer again by
depressing Check Reset and then Program Start. This is
possible because no information has actually transferred
and the records in the machine have not been affected.
2. If the parity check occurred on the FROM CYCLE, the ma-
chine will stop with the FROM CYCLE light on. Depressing
Check Reset and Program Start may be all that is neces-
sary unless an accumulator read-out and reset instruc-
tion is involved. If read-out and reset has occurred, the
accumulator has been reset to zero. The accumulator
data is retained in the magnetic-core unit and can be
used as an aid to reconstruction. It will normally be
necessary to restart the program at some previous in-
struction so that the accumulation can be built up again.
If an error persists on a track to track transfer, it is an
indication that the source data is incorrect.
To correct an invalid character occurring on the FROM
cycle, providing an accumulator operation is not involved,
the following procedure may be used:
a. Depress the Check Reset key.
b. Read the track that contains the parity error. All
100 characters on the track are typed, and if the track
contains an error, it will be automatically underlined.
c. After the full track has been typed, depress the alter
key. This will cause the typewriter to space across the
page and stop under the first invalid character.
d. Type any corrections that are required.
e. Depress the clear key after the last correction has
been completed.
f. Depress the write key.
g.
Depress program start.
3. If the parity check occurred on the TO cycle, the machine
will stop with the TO CYCLE light on. Depressing Check
Reset and Program Start is all that is necessary unless
a read-in to an accumulator is involved. If an accumula-
tion has occurred, transferred data is in the magnetic-
core unit. Depress Check Reset and make an inquiry of
the core unit. It may be possible to correct the error by
comparing the accumulator data with the core informa-
tion and the source record. However, if this is not pos-
sible, the program should be restarted at some previous
step where the accumulator is reset and the accumula-
tion can be started over again.
Clock Error Stop
Console Indication:
I. Processing Stops (Red Stop light on) .
2.
CLOCK ligh t on.
Cause:
Some phase of machine timing is out of step.
Restart Procedure:
1. Make a. note of the program step involved.
NOTE: The console may not indicate the error, until the
8 IBM RAMAC 305
following program step. Therefore, the restart procedure
must include at least the step on which the error is in-
dicated and also the preceding step.
2. Depress the Reset key, not the Check Reset.
3. Investigate the TO address track of both the error step
and preceding program step to be sure data was not
written in the wrong place.
4. If either or both of these steps are accumulator opera-
tions, it may be necessary to restart at a position in the
program where the accumulator is reset and the accu-
mulation can begin again.
5. Investigate the program steps which are to be re-exe-
cuted to insure that information will not be lost or
duplicated. For example, a slide operation, feed a card,
punch a card, etc.
6.
Set the Program Selector to start at the restart point,
and press program set.
7.
Start the program by depressing Program Start.
File Check Stop
Console Indication:
1. Processing Stops (Red Stop light on) .
2.
File Check light on.
Cause:
Record just stored on disk file does not agree with source
data on drum.
NOTE: Accumulator read-out and reset to the file is invalid
and will always cause a File Check stop. If the FILE hubs on
the process panel are not wired, a File Check stop will occur
on every file write operation.
Restart Procedure:
1. Depress Check Reset.
2. Depress Program Start.
3. If the error persists, the information can be retained by
typing out the disk storage record and the drum track
that is the source of the record being transferred. After
the error condition has been corrected, the data can be
re-entered on the drum track and the program restarted
at an instruction that will transfer the record to disk
storage.
Feed Check Stop
Console Indication:
1. Processing Stops (Red Light on) .
2. Feed Check light on.
Cause:
Misfeed in the card reader. A check is made as the cards
leave and arrive at each feed station. Therefore, any jam
should affect only one card that has not been processed.
Restart Procedure:
1. Depress Reader Stop.
2. Remove the cards from the feed hopper.
3. Remove any jammed cards from the feed.
4. Run out the remaining cards by depressing the Non-
Process Runout key.
5.
Restart by placing the last three cards (two cards if the
card failed to feed from the feed hopper into the feed
unit) in front of the remaining cards that are to be
processed.
6. Depress the Reader Start key to run the cards in.
Read Check Stop
Console Indication:
1. Processing Stops (Red Stop light on) .
2. Read Check light on.

Cause:
An error in reading or recoding the input card.
Restart Procedure:
1. Depress Reader Stop.
2. Remove the cards from the feed hopper.
3. Depress Non-Process Runout to clear the feed station.
NOTE: The card in error is the third card from the back
of the deck in the stacker, after the cards are run out.
4. The last three cards to run out of the machine were
not processed; therefore, place these three cards in front
of the remaining cards that are to be processed. Then
depress the Reader Start Key to run cards into the
reader.
Interlocked Track (Input or Output)
Console Indication:
1. Processing Stops (Red Stop light on) .
2.
Interlock light on.
3. Select light for interlock device on (Reader, Printer,
Punch or Type) .
Cause:
Programming has called for a transfer to or from the K
track before the last feed operation has been completed, or
it has called for a transfer to the output track before the last
Print or Punch operation is completed.
Restart Procedure:
1. Determine if the interlock is due to running out of
cards or paper. If so, replenish the cards or paper and
depress the corresponding input or output Start key.
2.
If the interlock is due to an input or output error con-
dition:
a. Depress the console Check Reset key to drop out the
interlocked instruction.
b. Process through a normal track investigation proced-
ure as described in Console Operating Procedures.
PRINTER ERRORS
Print Check Error (Parity or Print Setup Error)
Console Indication:
Depends on printer control panel wiring.
1. A -N. Stop: No console indication.
~2. A -Stop or Stop.
a. Processing stops on the next transfer-to-output in-
struction (Red Stop light on) .
b. Interlock light on.
c. Select Printer light on.
Printer Indication:
1. A-N. Stop.
a. Check light on.
b. Delta printed in the left margin of the line in error.
c. Printer continues to print.
2. A-Stop.
a. Check light on.
b. Delta printed in the left margin of the line in error.
c. Printing stops after the error line is completed.
3. Stop: Same as A-Stop, but no delta is printed.
Cause:
1. A parity error was sensed during the transfer from the
output track to the printer.
2. The print stick may not have been set up properly.
Restart Procedure:
1. A-Stop and Stop. Depress Printer Check Reset key.
a. Try printing the line again by depressing the Print
Repeat Switch.
NOTE: If the printer is in an MLP operation, the
Print Repeat switch must be depressed for each line
of the MLP.
b. If the error appears again, investigate the output
track (see Console Operating Procedures).
c. If the document is for internal purposes, the error
line may be crossed out or all delta lines disregarded
during future use of the document. Other documents
may have to be redone either by reprocessing or off-
line typing.
NOTE: Reprocessing will not be practical in most
instances because of file updating.
2. A-N. Stop.
a. At the end of the run, examine the output documents
for deltas, and make manual corrections where neces-
sary.
b. The Check light will remain on until the Check Re-
set key on the printer is depressed.
Form Light
Console Indication:
1. Processing stops on the next transfer-to-Qutput instruc-
tion (Red Stop light on) .
2.
Interlock light on.
3. Select Printer light on.
Printer Indication:
Form light on.
Cause:
Botton of last form is I Y2 inches from print stick.
Restart Procedure:
1. Successive depressions of the printer Start key will cause
the printer to print another line in order to complete
the last form.
2. Insert new forms and align to first printing line.
3. Depress the printer Start key.
PUNCH ERRORS
Punch-Parity Error Stop
Console Indication:
1. Processing stops on the next transfer-to-output instruc-
tion (Red Stop light on) .
2.
Interlock light on.
3. Select Punch light on.
Punch Indication:
1. Punch stops at the end of the punch cycle.
2.
Parity light on.
Cause:
One or more of the 100 positions of the -output track (in-
cluding those not being punched) failed to pass the parity
check.
Restart Procedures:
In general, the operator should try to punch the card
again. If the error continues, either of the following pro-
cedures may be used.
Restart Without Clearing the Feed-Correct Later
1. Depress the 380 Console Check Reset key.
2. Read the output track. All 100 characters on the output
track are typed, and, if the track contains an error, it
will be automatically underlined.
3. Depress Program Start.
REFERENCE SUMMARY 9

4. Remove the cards from the punch stacker to facilitate
finding the error card, and depress the punch Check
Reset and Start keys. The second card to reach the
stacker is the card in error, and it may be corrected
manually.
Correct the Error, then Restart
1. Depress the 380 Console Check Reset key.
2.
Read the output track.
3. After the full track has been typed, depress the Alter key.
4.
Type any corrections that are required.
5. Depress the Clear key after the last correction has been
completed.
6. Depress the Write key.
7. Depress Program Start.
8. Remove the cards from the 323 Punch hopper, and de-
press the Punch Check Reset key. Run the remaining
cards out of the machine with the Start key.
9.
Remove the error card, which will be the second card
into the stacker.
lO. Place the last correct punched card in front of the
input deck if gangpunched data must be saved. (The
first card in on a run-in is not punched.) The corrected
output track information punches into a new card and
programming proceeds.
Punch Feed-Check Stop
Console Indication:
1. Processing stops on the next transfer-to-output instruc-
tion (Red Stop light on) .
2.
Interlock light on.
3. Select Punch light on.
Punch Indication:
Feed Check light on.
Cause:
Full stacker, an empty hopper, or a feed failure.
Restart Procedures:
A. Empty Hopper or Full Stacker.
I. Place cards in the hopper or remove cards from the
stacker.
2. Depress the Punch Start key.
B.
Feed Failure-Misfeed from Hopper.
1. Remove cards from hopper.
2. Depress Start key to clear feed.
3.
Remove the last punched card. The last punched card
will be repunched because the information concerning
this card is retained on the output track.
4. Replace the unpunched cards in the hopper. If neces-
sary, a
gangpunch master card precedes these cards.
5. Depress the Start key.
C. Feed Failure - to Feed Into Punch Brush Station.
I. Remove the cards from the hopper.
2. Remove any damaged cards and clear the feed.
10 IBM RAMAC 305
3. Remove the last punched card (this may be the dam-
aged card) . The last punched card will be repunched
because the information concerning this card is retained
on the output track.
4. Replace the cards in the hopper. If necessary, a gang-
punch master card precedes these cards.
5. Depress the Start key.
DPBC Error Stop
Console Indication:
1. Processing stops on the next transfer-to-output instruc-
tion (Red Stop light on) .
2.
Interlock light on.
3. Select Punch light on.
Punch Indication:
DP & BC light.
Cause:
Either a double-punch or a blank-column error (or both)
has occurred. When this type of error is signaled, the card
in error has passed the punch brush station. The error can
indicate that either the output punching is incorrect, or that
an error occurred in a gangpunched field.
Restart Procedures:
If the output punching is at fault, it may be necessary to
reconstruct the output because the information in error has
been replaced on the output track with the succeeding record.
This can usually be accomplished by investigating the file or
processing drum tracks, or by checking the printed document.
In some cases it may be desirable to carry, in the program,
the output data on a working track for one additional punch
cycle. Then the operator can investigate the working track
and correct the card manually.
If the DPBC stop was caused by gangpunching, the feed
must be cleared and the operation restarted.
Two methods for restarting the punch after a DPBC stop
are:
METHOD I
No Gangpunched Fields Checked for DPBC
I. Depress the punch Check Reset key.
2. Depress the punch Start key. Continuous operation will
be resumed. The first card to reach the stacker after
depressing the Start key is the card in error. It must be
corrected manually.
METHOD 2
Gangpunched Field Checked for DPBC
1. Remove the cards from the feed hopper and stacker.
2. Depress Check Reset.
3. Depress the Start key to clear the feed. The first card
into the stacker is in error and must be corrected man-
ually. The second card is not in error, but will be re-
punched on the run-in.
4. Place the last correct card in front of the deck (for
master gangpunch information) and run the cards in
with the Start key. The first card in is not punched.

EACH SECTION of the control panels is assigned a number
under which the hubs are briefly described. Shaded areas indicate
special features.
Process Control Panel (Figure 1)
1. Program Exits. These hubs emit an impulse whenever the
corresponding program exit occurs
in an instruction. The impulse
is used to make tests on the control panel, and to transfer
program control to the first step
of a new sequence of instructions.
When one of these hubs emits, the program sequence is halted,
and must be restarted by impulsing program advance or by im-
pulsing program entries.
When Program Exit Split is installed, either the upper or
lower exit hubs of a group will emit depending on which control
hub was impulsed last.
2. Dual Access. These hubs provide control over the mode of
Dual Access operation. When the C (common) hub is not wired
to the SEL (select) hub, the access arms operate
in the automatic
sequence mode.
With the C hub wired to the SEL hub, either the
o (zero) or 1 hub may be impulsed from a Program Exit, Cycle
Delay
or any other impulse originating on the 305 panel, except
CI (control impulses), and the upper hub of the Inquiry ON
switch. The corresponding access unit will then accept all J,
Record Advances, Skip-To-Record, and R instructions until the
other access unit hub is impulsed. If· the C hub is permanently
wired to either access unit hub (0 or 1) the system will then
function
as a single access system using this unit.
3.
DPIS (Dual Process Interlock Suspend). When the PU
hub of DPIS is impulsed by either system in Dual System Control,
it suspends the interlock that prevents reading or writing a record
until the arm
of the other system has moved from this same
address.
When the PU hub is impulsed on one process control
panel, it suspends the interlock for both systems; however, only
the system initiating the suspension can re-establish
the interlock
by impulsing
the DO hub. If PU has been impulsed on both sys-
tems, the DO
hub on both process control panels must be impulsed.
When a system impulses PU, it cannot write in the file; a write
instruction causes a file check. A light on the console
of each
system indicates
when the interlock is suspended for that system.
4.
ALC (Automatic Last Card). If the ALC switch is not
plugged (when the cards have run out of the card reader hopper,
and the last card has passed the second reading brushes), the
card reader will stop. The operator may depress the Reader Start
key, and feed
the last cards to the stacker. Just after the operator
depresses the Start key, the last card selector transfers.
If the ALC switch is plugged, the card reader will feed cards
for one additional cycle before stopping.
During this additional
cycle the last card selector transfers,
and any last-card routines
that have been programmed utilizing the last card selector can be
completed.
The cards may then be fed into the stacker by depress-
ing the Reader Start key.
5.
Inquire. The pair of hubs marked ON form a switch that is
jackplugged if manual inquiries to the disk records are to be
allowed
during processing.
The IN-OUT hubs form an interlock that is wired to allow the
console to take control
of the access arm at a time when it will
not countermand the stored program instructions. The inquire
interlock is
wired in the program at a point where the access arm
Control Panel Summary
has completed its use of the record. If the arm is about to be
moved by the program, no harm will be done
if the operator
moves the access arm to some other record to make an inquiry.
When the record has been obtained for the operator, the stored
program resumes control and moves the arm to the next record
required.
A
program exit wired into the IN hub emerges immediately
from the OUT hub if no inquiry has been set up at the con-
sole
or is delayed if an inquiry is set up. The impulse from
the OUT hub is wired to initiate the next program step.
6. ITI (Inquiry-Type Interlock). The typewriter may be used
to make inquiries to the disk records
as described in item 5. The
typewriter may also be used as a secondary output printer by ad-
dressing the
output record to Q track and impulsing TYPE on the
control panel (see item
33). If both of these uses occur in the
same program, the inquiry-type interlock must be jackplugged to
prevent an inquiry from taking place while the typewriter is under
program control.
7. File Interlock. This interlock is provided so that new pro-
grams may be tested
without changing the information on the
disks.
When a program has been checked out, this switch is wired
to allow
the disk records to be changed. All operations except
writing on the disks may be performed with the interlock off.
A write operation
will cause a file check.
8. Accumulator Sign. Each accumulator has an associated
selector that shows its sign. By using a program exit impulse, a
test may be made to determine
if an accumulator is positive, stands
at zero,
or is negative.
9.
Accumulator Overflow. Whenever an accumulator over-
flows (tries to accumulate a number beyond its capacity), a
path
is established between each IN hub and its YES hub. These paths
remain set
up until the accumulator overflow selector is dropped
out by impulsing DO. A normal path is established between the
IN hub and the corresponding NO hubs when the selector is
dropped
out or when no overflow has occurred.
10.
Character Selectors .. The character selectors provide a way
of analyzing any character on a drum track. The position to be
analyzed is entered into this
unit by an instruction with hyphen
(-99) as the TO address. Any character entered establishes test
paths between each
IN hub and the exit hubs corresponding to
the character entered.
Four distinct paths are set up on the basic machine. Three of
the paths are arranged so that a test impulse entered into
the IN
hub emerges from the hubs corresponding to the IBM card code
of the character being tested. In the fourth path, an impulse wired
into the
IN hub emerges from one of the 48 exit hubs representing
the specific letters, numbers, and special characters (including
blank). The test paths remain set up until another character is
addressed to the unit.
The special feature X no-X and 0 no-O bit selectors provide
analysis
for the presence or absence of these bits in the character
sent to the character selector.
11.
Blank Transmission. A 6 in the tenth position of an in-
struction causes
the Blank Transmission selector to reset to a
NO condition. If the information transferred from the core storage
during the execution of the instruction is all zeros or blanks, the
selector
will transfer to a YES condition and the BLANK light on
the 380 Console will be
turned on. The selector will remain trans-
ferred
and the light will remain on until another instruction with
a 6 is read.
REFERENCE SUMMARY 11

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01I I1
01I 1
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01II 1
01I I1
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AO/FLOW I 2 CHARACTER SELECTORS
LOIN 0 0 I o-!!:-o o--!!!-o o-!b..o o--!!io o.!ho
G H I J K L M 12 4 12 4 12 4
M 1
(bI 0 0 0 0 0 0 0 ()-'-=-(J Q---'--O 0--.:-=-0 0--'-0 ~ Q--'-O
NO N 0 P Q R S T 11 5 II 5 II 5
N 9 ooooooo~o--:---o:::Nt::D-'-'-<)()--"-<)
u v w x y z 10
P I I I 0---0-------0-- 0 0 0 0 0 0 o-f!-o ~ 0 o-!-o 0--2-0 o--!-o
YES '0· I 2 3 4 5 6
Q 0---0-------0-- 0 0 0 0 0 0 0 o--!-o 0--1-0 o---!-o o-l-o o-l-o o-I-o
I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
: f! ::: ~~!,: :::: '!~!m~'"r: ::: '! :::: 'f~ J,: ::!:I
AM 10 0000000 0ffiit0 0 0 0 0 0 GOO 0 0 0 0tf1t0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1
41_45-IN 26 55-DISTRIBUTORS-65 26 70-IN B~
:: 1111111111 111111111111111 111111111111
OUT OUT
AQ 0 a 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
AR 10--0------0---- I 0------0--0---- I ~ I 0----0------0-0 1 0------0-0-----1
:: IillrTITII I I I I9r ill I I I I
OUT
8M
8R
Figure 1. 305 Process Control Panel
12 IBM RAMAC 305

12. Last Card. This selector is used to control machine opera-
tion on the run-out. Normally, a path exists between each
IN hub
and the
NO hub beneath it. When the cards have run out of the
card reader hopper, and the last card has passed the second read-
ing brushes,·
if no more cards are to be entered, the operator may
depress the Reader Start key and feed the last cards to the stacker.
After the Start key has been depressed to initiate an additional
feed cycle, the last card selector transfers. The program control
may be wired through this selector to control the last card routine.
13. Compare. This selector stores the result of the last pro-
grammed comparison. A path
is set up between each IN hub and
the =
(equal) hub beneath it whenever the two fields are exactly
equal, and between the
IN hubs and their =I=- (not equal) hubs
when the two fields fail to compare. These paths remain set up
until another programmed comparison is made.
14.
Field Compare. The field compare device is provided to
allow,
with one instruction, from one to ten fields on the track
specified by the
FROM address to be individually compared with
the fields of a track specified by the TO address. The FROM address
may refer to a process drum track, a disk track,
or the core unit.
The TO address may specify any process drum track other than
the accumulator track. Neither the core
unit nor the disk file may
be used
as the TO address. A 2 code is placed in the tenth position
of the instruction to cause automatic field comparing.
The results
of a field comparison will be indicated in the ten selectors associ-
ated with the field compare device.
15. Communication. These hubs are connected to the cor-
respondingly numbered hubs of the communication section on
the printer, console
(TW), and punch control panels, they allow
for signal communication between the machine units.
16. Start. When the first input card after any run-out except
non-process run-out has been read and checked, an impulse
is
emitted from this hub. This impulse is used in the same manner
as a Program Exit impulse to start the stored program at the de-
sired instruction.
17.
CI (Control Impulse). Two buttons are provided on the
operator's panel at the console to allow a control impulse to be
emitted on the control panel. This allows the operator to pick up
or drop out selectors, or initiate other functions from the console.
These impulses are emitted from the correspondingly numbered
CI hubs on the control panel.
18. Skip-To-Record. When one of the numbered hubs associ-
ated with Skip-To-Record is impulsed, the access arm remains on
the same disk and track,
but the disk address register is advanced
so that the units position of the disk address corresponds to the
number of the hub impulsed.
After the corresponding address has been
set up in the address
register, the
OUT hub emits. This impulse is wired to restart the
program. Normally, this device will be used in conjunction with
field compare.
19. Copy.
When the copy IN hub is impulsed, the machine
automatically transfers the contents of the
input track to track I
of the program storage tracks. If the input card is punched with
instructions, this records instructions 190-197
on track I. The IN
hub may be impulsed from the START hub.
When the transfer to track I is completed, the OUT hub emits
an impulse that
is wired to start the stored program at any step.
Usually
it is wired to start the program at step 190.
20. Reset. When impulsed, this hub causes the corresponding
group
of ten selectors to be dropped out.
21. Alteration. A row of switches on the operator's panel at
the console is provided to allow various changes to be made in
the program setup by changing the settings of the switches.
On
the control panel, these switches are wired in a manner similar to
selectors. Program exit impulses wired into the
IN hubs emerge
from the N
(normal) hub of the same vertical row if the cor-
responding toggle switch
is in the normal position. They emerge
from the T (transferred) hub if the toggle switch is transferred.
22. Cycle Delay. These units provide a delayed impulse that
may be used for control functions, such
as the pickup and dropout
of selectors.
An impulse wired into the cycle delay IN hub emerges
from the
OUT hub thirty milliseconds later, where it may pick
up or drop out selectors after the control impulse has ended.
Whenever Cycle Delay
is impulsed, programming must be ad-
vanced by the delayed
OUT impulse. Additional Cycle Delay
hubs may be located at
AF-AH, 6-20 if Input Analysis selectors
are not installed.
23. Analysis Selectors. These selectors analyze designated
input card columns for specific codes. Two
PU hubs are connected
to each selector. One
PU hub is wired from the Input Track
Control Exit to be tested for the code; and the other hub
is
wired from the CARD CODE to be detected. When both PU hubs
receive the same digit impulse, the selector transfers and remains
transferred until the next feed card instruction. A blank column
can be detected by wiring both
PU hubs from the same INPUT
TRACK CONTROL EXIT; transmission of any card code causes the
selector to transfer.
24. Selectors. Latch-type selectors are furnished to provide for
storage and control of operations. Each selector position has a
COMMON, NORMAL, and TRANSFERRED hub. The COMMON hub is
connected to the NORMAL hub until the selector is picked up by
impulsing the PICKUP hub. Then the COMMON hub is connected
to the
TRANSFERRED hub until the DROPOUT hub is impulsed.
Group D selectors may be added at BG-BR, 11-20 if
Input Analysis
Selectors and Isolators are
not installed.
25. Record Advance. These hubs advance the address in the
address register one sector per impulse. This feature
is used
mainly to obtain additional sectors where a record is spread over
more than one sector.
When the IN hubs are impulsed, the ad-
dress in the address register
is advanced one sector on the same
track.
When the advance is completed, the OUT hubs emit an im-
pulse that is wired to restart the program.
When the advance goes
from sector 9 to sector 0, the olF hub emits instead of the
OUT.
26. Distributors. Impulses that are used to initiate several
functions are wired through distributors that serve the same
function
as split wires but prevent possible back circuits. An
impulse wired into the IN hub of a distributor is available at the
associated
OUT hubs, but impulses cannot travel between OUT
hubs, or from an OUT hub to the IN hub. Any impulse except
that from the
OUT hub of another distributor may be wired
through a distributor.
27. Program Advance. The stored program sequence is halted
when the control is brought to the control panel
as an electrical
impulse. To restart the program at the next higher step, the Pro-
gram Exit impulse is wired to impulse Program Advance.
28. Program Entry. When the program control has been
brought to the control panel on a program exit, a new program
sequence may be started by impulsing the appropriate program
entries.
The hundreds program entry is impulsed only when it is de-
sired to change program steps from steps below number 100 to
steps above
100, or vice versa.
The new program step is set up by impulsing the tens and
units hubs that correspond to the number
of the program step
desired. Distributors should be used.
Program Entry Isolation removes the common connections be-
tween the entry hubs, and internally connects a distributor in series
with each hub. This eliminates the requirement for wiring a dis-
tributor
in series with each entry hub.
REFERENCE SUMMARY 13

29. Feed Card. Impulsing these hubs causes the card reader to
feed a card past each station.
The card passing first reading is
automatically coded and recorded on one input track, while the
card passing second reading is checked against the recording on
the other input track that was recorded from that card on the
previous card-feed cycle.
When the card passing second reading
has been checked, its input track
is made available to the process-
ing unit.
30. Print. Impulsing these hubs' causes the printer to print
from the output track. Format control on the printer determines
the arrangement of the printing.
31. Stop.
When these hubs are impulsed, the program will
stop.
If the program is advanced with the same program exit
which impulses
STOP, the program may be restarted by depressing
the Program Start key.
32. Punch. Impulsing these hubs causes the 323 Punch to
punch from the output track.
Wiring on the punch control panel
determines which columns are punched.
33.
Type. Impulsing these hubs causes the console typewriter
to
print the information recorded on the Q track. Format control
on the typewriter control panel determines the arrangement in
which this information is typed.
34. Reset Stop. These hubs may be impulsed from a stored
program exit impulse
when processing is to be halted. Impuls-
ing these hubs resets the processing unit and places the machine
in an inquiry-only mode
of operation so that inquiries may be
made. Restart by depressing the Reader Start key with cards in
the hopper and the feed clear.
35. Isolators.
Two IN hubs and one OUT hub in each Isolator
permit two similar impulses to be combined without interaction
between the two sources.
The IN hubs of the Isolator are used
to combine two Card Codes or two
Input Track Control Exits.
The OUT hub then emits the two impulses in the sequence in which
they were received.
The OUT hub of one Isolator should not be
wired to the
IN hub of another because connecting two Isolators
in this manner decreases the reliability
of the OUT impulse.
36. Eliminators.
Four Eliminators, with two entry hubs each,
are used to prevent the writing
of a specific card code on the input
track. The Input Track Control Exit is split-wired to the Card
Column Entry to be screened and to one hub of the Eliminator.
The other hub of the Eliminator is then wired from the specific
CARD CODE to be eliminated.
37.
Card Codes. These hubs emit card code impulses in the
same sequence
as the corresponding codes read from the input
card. These hubs must
not be split-wired; when two or more are
wired to the same entry, they must be wired through an ISOLATOR.
38. Input Track Control Exits. Each of these 100 hubs selects
the card column to be written
in a specific track location by an
impulse wired to the corresponding Card Column Control Entry
hub. Any track position
not wired will be blank.
39.
Card Column Control Entries. These 80 hubs receive
impulses from the
Input Track Control Exits to indicate to
which track position each card column will be sent. Any card
column not wired to an
Input Track Control Exit will not
send data to the
input track.
Printer Control Panel (Figure 2)
1. Print Control Exits. These hubs emit control impulses as
the printer is positioned to print the corresponding positions of
the print line. Each hub emits one impulse per line printed; for
example,
hub five emits an impulse every time print position five
is being set up. These impulses are wired to initiate functions such
as zero suppression, X-elimination, etc.
14 IBM RAMAC 305
2. Distributors. Impulses that are used to initiate several
functions are wired through distributors that serve the same
function
as split wires but prevent possible back circuits. An
impulse wired into the IN hub of a distributor is available at the
associated
OUT hubs, but impulses cannot travel between OUT
hubs, or from an OUT hub to the IN hub. Any impulse except
that from the
OUT hub of another distributor may be wired
through a distributor.
3. Analyzers. When a record has been transferred to the output
track, and
PRINT on the process control panel has been impulsed
by a control code, the
printer prepares to print a line. However,
before the
print mechanism moves from the home position, the
output track may be analyzed.
By wiring from the
ACI hubs of an analyzer to an output
track position, the digit
or character in that position of the
output track will condition the analyzer
so that the Analyzer
Exits will emit in IBM code.
The 2 exit emits for a 2, the 12 and
1 exits emit for an A, etc. If ACI is not wired to an output track
position,
BLANK will emit on each print cycle except MLP 2, 3,
and
4.
4. MLP (Multiple-Line Print). The MLP function controls
the printing of multiple lines from a single output record.
The
START hub corresponding to the number of lines desired is im-
pulsed from an Analyzer Exit. The MLP I hubs then emit an
impulse at the beginning
of the corresponding MLP line, in
sequence 1, 2, 3, and 4, up to the number of lines desired.'
(If the special MLP Repeat feature is installed, the additional
MLP I hubs 5 through 8 emit
in sequence for the corresponding
repeat lines.) These exit impulses can be wired to pick up Line
Program
or Co-selectors to control the format on the corresponding
print line.
MLP RPT. (Multiple-Line
Print Repeat). Impulsing the IN
hub serves to hold the 370 in MLP status after the initial MLP
lines are printed, and initiates printing of the first repeat line.
The OUT hub emits an impulse during the early analysis portion
(same time
as Analyzer A and B) of the first repeat line, and is
wired to MLP START to select the number of additional
MLP lines.
5.
Line Program Impulse. This impulse is available during
the analysis portion
of the print cycle. It is, however, inactive if
MLP START has been previously impulsed. During an MLP
operation, the MLP
IMPULSE hubs emit, and the LINE PROGRAM
IMPULSE hubs are inactive.
6.
Line Program Selectors. The' line program selectors are
provided to allow format control
of the information being printed
from the output track. Each selector has eleven positions; ten
of
these are grouped near the output track and an eleventh position
of each selector is near the control section. Each position has a
COMMON hub, a NORMAL hub, and five TRANSFERRED hubs. The
COMMON hub is connected to the NORMAL hub until one of the
five pickup hubs
is impulsed, usually from the MLP I hubs. Then
the
COMMON hub is connected to the correspondingly numbered
TRANSFERRED hub above it. The selectors remain transferred
until the line is printed and drop out as the
print head returns
to the home position.
7. Skip-To. These hubs are impulsed from Analyzer Exits
or from 305 control impulses wired through communication
channels to cause the tractor to feed the paper in the
printer to
the corresponding hole in the control tape.
In the carriage control
tape, channels 1-6 stop the corresponding skips. Channel
12 in
the control tape causes an impulse to be emitted from the
OF
(Overflow hub) that may be wired to advance the paper to the
first printing line on
the following form.

: n-I I-I II I I I I1111 'I -1 ri IT rTf -I III I I I rI I 1I 3f I I I I "11
: [1-1 I-I rr I I I rI I I I ITf1tY I I I I Sf I I I I II I I I 'f I I I I rl
: ~'NrT'Y®R'rTITTN I
OUT 2 OUT
G 0000 00000
I 5 10
H 0000000000
I-PU-DELAY-PU-IO
J 0000000000
IMMEDIATE PU- COUPLE A - LINE PROG. SELECTORS-H
K 10 0 0 0 0 0 0 0 0 0 0 I 0 0 0 0 0 0 I 0
L-i------------- 5 -------------- 10
L ~O TOO 0 0 TOO 0 0 TOo 2 0 0 0 0 0 0 2 0
M So NO 0 0 @~ 0 0 a N 0
E 25
N EO coo 0 ~ ~ 0 0 0 C 0
C-I -- --------- 5 --------------10
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R loco 0 a DCa 0 0 oCo
S o--R-o ~ ~ ~ 0 I 0----0 5 ~ o----Lo 0----9-0 o---1L-o I, ? 13f7\?5 I.
040 016" 0 040
050 0 ~ 0 050
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A- ANALYZER EXITS -OlST.-MLPI PROG. SEL. PU I . SKIP TO
T ~ o-'!-o 0-"-0 o-'!-o~02o-~ ~ ~ ~ ~ IcL.S~ACE~
u ~ 0-!4 0-!4 0-!4 P 0 3 o-~7 o-Lo o-Lo o-Lo o-Lo I ~ I II 12 I® II1
: ~ ~ ::: ~ D~'~E®~DG: ~ :::®7 ~I :~ ~~~"~3_~ }_Oo, _ o·~ _7 --+-,. ~~---O--O-O---O---O-~
E 5 -F 6 G-H
X ~ o--!-o ~ ~ ~f3\~ 0---------0 ~ r-------o 0-----0 0-------0--0--- 0----0--------- ~---O--O---o---o--<>+I
y ~ ~ ~ E ~ \:) ~ ~ o---!-o o-!-o ~ 0---0---0--0--- ~>--o--o-..-..I o----<r--o---o---o--o-~r
z ~ ~ ~ 0-2-0 0--2--0 0-2-0 o--Lo o--l--D 0-----0--0----- o-~---o--<:r"J;~.
AA ~ ~ ~ ~ ~ o---±-o o---±--o ~ o-i-o ~ er--o---o----o--o--o
AS ~ 0-2-0 o--!-o 0-1-0 ~ o--i-o o---E-o o---E-o 0--2--0 0-------0--0--- O---O---C~I
El. PU~---.------
I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
~------- PRINTSPACE------------,
~~~~~~~~~§~~~~~~~~~
A B-LlNE PROGRAM $ELECTOR$-C 0; IT)
AL 0000 010 a 00000000100000,0000010000000000100000
AM 0 0 0 0 0 2 0 0 0 coO 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0
AN 0 0 0 0 0 3 0 0 0 0 (l 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0
AP 0 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 r;:;'\ 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 4 COO 0 0
AQ 0 0 0 0 0 5 0 0 0 0 0 0 0 0 0 0 5 0 0 0 0 ~ 0 0 0 0 5 0 0 0 0 0 0 0 0 (J 0 5 0 0 0 0 0
AR 0 0 0 0 0 N 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 0 I0 0 0 0 0 N 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 0
AS 0 0 0 0 0 Coo 0 0 0 0 0 0 0 0 coo 0 0 0 0 0 0 0 0 Coo 0 0 0 0 0 0 0 0 Coo 0 0 0
I 5 lO---15-PRINT P~N EXITS-25 30 35 . 401
AT 10 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
~ j II !j I! II !!j n-j ! r~"fmI j! nI!I! '(-! II 'I
~: 1I1111111IlIliI l~lllnl!lni !!j'Jnn
~ f!! ! Ii !!IMI!I nIn!
~---_---PRINTSPACE--'-"<----------,
:: I (§---o---o--o---o---<>---O--O-~-o--o--<)---O--O-~~
,------E F-LiNE PROGRAM SELECTOR-G H----,
BJ 0 0 0 0 0 I 0 0 0 0 0 0 0 0 0 0 I 0 0 0 0 0 I 0 0 0 0 0 I 0 0 0 0 0 0 0 0 0 0 I 0 0 0 0 0
8K 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0
BL 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0
BM 0 0 0 0 0 4 0 0 0 a 0 0 0 0 0 0 40 0 0 0 Tc\ 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 40 0 0 0 0
~ 0 0 0 0 050 0 0 0 0 0 coo 050 0 0 0 ~ n 0 0 050 0 0 0 0 0 0 0 0 050 0 0 0 0
BP 0 0 a 0 0 N 0 0 0 a 0 0 a 0 0 0 N 0 0 0 0 0 I0 0 0 0 0 N 0 0 0 0 0 0 0 0 0 0 N 0 0 0 0 0
00 0 0 0 0 oCo 0 0 0 0 0 0 0 0 oCo 0 0 0 0 0 0 0 0 oCo 0 0 0 0 0 0 0 0 oCo 0 0 0 0
BR r~-o-o-o 4; 0 0 0 0 ~o~-o -0 5~-0 -0 ~RIN~ I I ~XIT;-o 6; 0 0 0 a 7;] a 0 a 0 7; 0 0 0 a 8~1
Figure 2. 370 Printer Control Panel
REFERENCE SUMMARY 15

;c
»-
~
»-
()
w
o
U'1
,-
ANALYSIS
·1-
(])
"0 2
32 ...
Carriage Always Moves this far
CONTROL PANEL HUBS
>.
0
U Z 0 2 4 6 8 10 12 14 16 18 20
Analyzer Control Impulse (A)
A *
-.
Analyzer Control Impulse (B) A *
....
Analyzer Control Impulse (C)
A *
.. -
Analyzer Control Impulse (D)
A *
•••
Pilot Selector Couple Exit A
:-
(Special Feature)
MLP Repeat Out Impulse
( Special Feature)
A 6
••
Analyzer Exits (A & B)
A 1
••
Analyzer Exits ( C & D ) A 1
••
Line Program Impulse A 2
1-.
Line Space 1 A
I-~
Line Space 2 A 3
I-
I-
Line Space 3 A 4
I-~
I-
1-.
MLP Impulse A 2
I-~
OF (overflow) A 5
I-
..
..
r--
..
Print Control Exits B
..
I--
~
I--
Print Position Exits B *
~
370 PRINTER CONTROL PANEL ENTRIES
CONTROL PANEl HUBS
Communication
Distributors
Line End
Line Prog. Sel. Pickup
Line Prog. Sel. (Transfer)
Line Space Common Hubs
NX-Eliminate
Output Track
Print Space
Print Start
Print Stop
Selector Pickup
Selector (Transfer)
Skip-To
Symbols
X-Eliminate
Zero Supp. Start
Zero Supp. Stop
ENTRY DESCRIPTION
Accepts whatever is entered.
Accepts any low level impulse.
Wire from any print control exit.
Accepts any low level impulse.
Transfer immediately; drop out with line end.
Will accept only line space 1,2, or 3.
Wire from any print control exit.
Wire from ACI or print position exit only.
Wire from any print position exit.
Wire from any print control exit.
Wire from any print control exit.
Accepts any low level impulse.
Transfer immediately; drop out with line end.
Accepts any low level impulse.
Wire from any print control exit.
Wire from any print control exit.
Wire from any print control exit.
Wire from any print control exit.
22
r--
..
..
I--
P RI N T
• 32-Carriage Under Control of Print Stop---{
24
26
28
30
0
I--
•
.:-
r--
-'
r--
•
r--
..
r--
-'
t--
..
I--
•
t--
..
r--
12
t--
13
t--
14
r-l
• ••• • •
I--
.-i
r--
..
I--
•
r--
..
t--
..
r-
•
r--
•
t--
•
t--
•
t--
•
t--
15t-
•
~
••
Machine Cycle Code:
A. Emit only during analysis portion of cycle.
B. Impulses continue for all 80 print positions.
Notes:
1. Emit if Analyzer Control Impulse hub has been wired to an output track
position. (Blank emits on each print cycle except MLP 2, 3, and 4 if
ACI is not wired to output.)
2. If MLP START has been impulsed, LINE PROGRAM IMPULSE is
inactive.
3. To select double spacing, selectors must be transferred in time to accept
the first impulse.
4. To select triple spacing, selectors must be transferred in time to accept
the first impulse.
5. Under control of the carriage.
High Level Impulses.
6. Emits on first repeat line.
Figure 3.. 370 Printer Timing Chart

8. OF (Overflow). When a hole is sensed in the 12 channel
of the carriage control tape, during the analysis portion of a print
cycle, it causes an impulse to be emitted from these hubs. The
impulse may be wired to cause the paper to be skipped to the
first line of the following form by impulsing one of the skip-to
hubs, and placing a hole in the control tape in that channel to
stop the tape at the
proper place. The OF impulse may also be
wired through communication channels to the processing control
panel, where it may pick
up a selector that is tested in the course
of the program to determine
if the overflow condition exists.
Then steps in the program can decide whether to complete the
form or start the following form. If the printing is to overflow
to the next form,
the processing unit can, by control codes wired
through communication channels, control the overflow skip.
9. Line Space. To allow variable spacing, the space control
impulses are wired on the control panel. A jackplug may be
inserted between one of the numbered hubs and the space hub
above it to cause single, double, or triple spacing. Alternatively,
the space control wiring may be selected to allow variable spacing.
10. Communication. These hubs connect to the correspond-
ingly numbered hubs on the 305 Process Control Panel to allow
signal communication between the processing unit and the printer.
11. Print Start. These hubs are impulsed from Print Control
Exits to start printing at any desired column as the
print head
moves across the paper. Once the printing is started, the machine
will continue to
print until printing is turned off by impulsing
Print Stop. In this way, printing can be turned on and off several
times
in the course of printing a line to give added flexibility in
format control.
The Print Control Exit for the first column of
each field to be printed is wired to these hubs.
12. Print Stop. These hubs are impulsed from the Print Con-
trol Exit of the first position not to be printed, to turn
printing
off, if other information is to be printed later on the same line.
Impulsing these hubs causes printing to be suppressed until Print
Start is impulsed.
13. Line End. These hubs are wired from the Print Control
Exit of the position after the last position to be printed on a
line to cause the printing to stop and the
print head to return to
the home position.
This allows the length of the printing line to
be controlled. Variable printing lengths are possible by wiring
Line End through selectors.
14. Zero Suppression Start. These hubs are wired from the
Print Control Exit of the high-order position of a field to
eliminate the
printing of zeros to the left of significant digits.
When these hubs have been impulsed, the print unit spaces over
positions containing zeros until a significant digit (1-9) is
encountered and
printed; then all zeros to the right of the sig-
nificant digit are printed.
15.
Zero Suppression Stop. Once Zero Suppression Start
has been impulsed, zero suppression will continue until a sig-
nificant digit (not zero) is encountered and printed or until it is
ended by impulsing these hubs from the Print Control Exit
of the first position not to be suppressed.
16.
X-Eliminate. Negative numbers are recorded on the output
track (as on all other processing tracks) by an X-bit over the
low-order position.
For example, the amount 125 stands on the
output track at 12N. The X-eliminate and NX-eliminate hubs
allow the printer to read the X-punch or the digit punch from an
output track position to separate the signed character into its sign
and digit components. These hubs are impulsed from
Print Con-
trol Exits to cause only the digit portion of the character being
set up to be printed.
17. NX-Eliminate. These hubs are impulsed from the Print
Control Exits to allow only the sign portion of a character to
be printed
(item 16).
18. Ll (Delta). When the two hubs labeled Ll STOP are jack-
plugged, if a
print setup error occurs, the machine will print a
Ll in the left-hand margin opposite the line in error and the
machine will stop.
When the two hubs labeled Ll N. STOP are jackplugged, the
machine will
print a Ll, but will not stop when a print setup
error occurs.
If neither Ll STOP nor Ll N. STOP are plugged, the machine will
stop,
but a Ll will not be printed if a print setup error occurs.
19. INTLK (Interlock). These hubs must be jackplugged
before any printing operation can be initiated.
The printer will
not operate
if these hubs are left unplugged.
20. Symbols. These hubs are wired from the Print Control
Exits to cause the corresponding symbol to be printed. These
symbols may be selected through the line program selectors.
21. Co-selectors. These selectors may be used to supplement
the line program selectors. Each co-selector has
five positions, and
each position has a
COMMON, a NORMAL and a TRANSFERRED hub.
Normally, a connection exists between the COMMON and the
NORMAL hub, but when the PICKUP hub is impulsed, this con-
nection
is broken and a connection is made between the COMMON
and the TRANSFERRED hub in the same vertical column. Co-select-
ors may be picked up in the same manner as the line program
selectors, and they remain transferred for the entire print line.
22. Output Track. At each printing position, the output track
is read in its entirety, but only one character is selected for print-
ing. This selection is made by wiring the hub corresponding to
the output track position desired to the Print Position Exit
corresponding to the
printing position where the character is to
print.
23.
Print Position Exits. These hubs are wired from the out-
put track (item 22) to cause the corresponding positions to be
set up to print information on the output track. For example, to
print position ten of the output track in print position 50, Output
Track position 10 is wired from Print Position Exit 50.
24. Print Space. All print positions that are not wired from
the output track should be wired to these hubs. This indicates to
the checking circuits that the
printer is not to print in the corre-
sponding column, and allows the checking circuits to detect any
position that was wired to
print and failed to set up correctly.
25.
Pilot Selectors. These selectors may be used to control
printer functions based on Program Exit impulses received
through communication channels,
or from 370 impulses.
IMMEDIATE PICKUP: Selectors transfer immediately when im-
pulsed from Analyzer A,
B, C, or D Exits, Space, Overflow,
MLP I Exits 1-4 (special feature MLP Repeat,
MLP I exits 5-8),
or a program Exit. (The program exit used must also impulse
Print on the process control panel, and normally should not be
used to impulse 370 functions directly -these functions should
be controlled by the pilot selector.)
DELAY PICKUP: Accepts the same impulses as immediate pickup
to transfer the selector for the following line,
or lines, if MLP.
Exception: the couple exit of another pilot selector. When a
program exit is used to impulse delay pickup, the selector trans-
fers immediately on the first line after the program exit.
COUPLE EXIT: When the delay pickup hub is used, the im-
mediate pickup hub becomes a Couple Exit.
Drop-out: The selectors normally drop out at the end of the
line, or in the case of MLP, at the end of the last MLP line. They
may be dropped out manually by depressing the Printer Reset
key. Depressing the Printer Check Reset key does
not drop ·out
the pilot selectors; they remain transferred and allow the selectors
to provide the same control for all Print Repeat lines.
REFERENCE SUMMARY 17

Punch Control Panel (Figure 4)
1. Output Track. These hubs emit the IBM codes of the in-
formation on the output track. These exits may be wired to the
punch magnets to cause punching. This allows any
of the 100
output track positions to be punched into any of the 80 card
columns.
2. Digit Selector. The or hub at the top of the panel emits a
series of impulses which are timed for punching the digits
12
through 9. If the or hub is wired to the C hub beneath it, the
digit selector becomes a digit emitter with a
12 impulse available
at the
12 hub, an 11 impulse available at the 11 hub, etc. If an
output track position is wired to the C hub, whatever digit or
character appears at that output track position will be made avail-
able in IBM code at the numbered hubs of the digit selector.
3. Sign Conversion. Within the system, the 12 holes are coded
by a combination of X and a-bits. Also, sign control on negative
fields is maintained by carrying an X-bit over the low-order posi-
tion. If the low-order position of a field is zero and the field is
negative, a 12-hole would be punched
if this position were wired
directly to a punch magnet.
The sign conversion hubs are provided
so that the 12-impulse available from the output track may be
converted to the
x/a code desired for these positions.
In use, the low-order position of any numerical field that may
be negative is wired from the output track to an
IN hub and from
the corresponding
OUT hub to the punch magnet. If a 12-code is
emitted from this position of the output track, it
is punched as
X/O. Any other negative number is overpunched with an X.
Positive numbers pass through without conversion.
4.
Column Splits. This is a la-position selector that is auto-
matically controlled to transfer between X and a time as the card
is punched. This allows the 12 and X zones to be removed from
columns and punched into other columns.
5. Co-selectors. As a special device,
up to five groups of four
5-position Co-selectors may be installed to allow changes in punch-
ing format for different types of cards. Each selector is a five-
position selector with two common pickup hubs. Each position has
a C (common), N (normal) and a T (transferred) hub.
The
common hub is connected to the normal hub until the selector is
picked up
by impulsing the pickup hub. Then the common is
connected to the transferred hub.
When the pickup is impulsed, the selector transfers immedi-
ately, and will remain transferred for the remainder of the punch
cycle.
The Co-selector pickup hubs may be impulsed from any digit
impulse, Half-After-Zero,
(0-5), Pilot Selector COUPLE, or from
the Punch Repeat
OUT hubs; however, they should riot be im-
pulsed by a 305 Program Exit wired through a Communication
Channel. Co-selectors must be used
if it is necessary to select BC
DET CONTROL wiring when controlling DPBC checking for dif-
ferent card formats, as well as the DPBC STOP, OFFSET, and BC
OFF switches.
6.
Punch Magnets. These hubs are entries to the 80 punch
magnets that punch the correspondingly numbered columns
of the
card. These magnets are wired from the output track positions
that are to be punched.
7. Punch Brushes. On the punch cycle after a card is punched,
it passes a set of 80 reading brushes that read back the informa-
tion that has been punched so that it may be given the double-
punch blank-column check. These hubs are the exits for the read-
ing on this cycle. The information may also be gang-punched back
into the following card.
8.
DP & BC Det Entry. These hubs may be wired from the
punch brushes to check individual columns for double punching
or lack of punching. This is particularly valuable in numerical
18 IBM RAMAC 305
fields, where every posltlOn must have one and only one hole.
If the machine detects multiple punches or lack of a hole in any
column wired,
it will stop the machine if the control is wired to
do so. The DPBC light on the punch unit is turned on to indicate
the reason the machine stopped.
9.
BC Det Entry or GP Exit. If the column being checked is
wired into DP & BC DET ENTRY, the first impulse to enter the DP
& BC DET ENTRY emerges from these hubs, from which it may be
wired to a punch magnet for gangpunching.
If a column in which double punching is permissible is to be
checked for blanks, these hubs are used as an entry. The first im-
pulse to enter these hubs emerges from the DP & BC DET ENTRY
hubs.
10. BC Det Control. If no checking for blank columns is to
be done, the Blank Column
OFF switch (item 12) must be
wired.
To check a field for blank columns, wire the field to the
ENTRY or EXIT of the DP & BC If anyone field is to be checked,
wire it to the left-hand entry positions and, in the blank-column
detection control row, wire from the right-hand column
of the
field to the last position in the row. Several fields can be entered
as one field for checking purposes.
11.
DPBC Stop. When these hubs are jackplugged, the ma-
chine will stop if a DPBC error occurs. This switch may be
selected if co-selectors are used.
12. BC Off (Blank Column Off). These hubs must be jack-
plugged to turn the blank column detection feature off when no
punched columns are to be checked for blank columns.
13. Offset.
When the Offset Stacking Feature (special device)
is installed, the DPBC Offset switch may be plugged to offset an
error card rather than stop.
It is also possible to offset different
types of cards
so that they may be easily distinguished from the
main group of cards when removed from the stacker. This switch
may be selected; however, co-selectors must be used.
14.
INT (Interlock). Whenever the punch is to be used to
punch output cards for the processing unit, this control panel
switch must be jackplugged.
15.
Gangpunch. When this control panel switch is jack-
plugged, the 323 Punch is removed from the control of the
processing
unit and may be used as an independent gangpunch.
16. Communication. These hubs are connected to the corre-
spondingly numbered hubs labeled PCH on the process control
pane1.
17.
Punch Repeat. When an impulse is wired to Punch Repeat
IN (P or D), one additional card will automatically be punched
from the same output track data.
If selectors are used, two cards with different formats can be
obtained from the single
output track. Without selectors, two
identical cards are punched.
When Punch Repeat has been impulsed, the OUT hub on the
Punch Control Panel will emit just
prior to punching time of the
second card.
This impulse may be wired to the D pickup of pilot
selectors
or to co-selector pickups to control the punching for
the second card.
A program exit wired through a communication channel for
the purpose of impulsing punch repeat must be wired to the P
(program exit) pickup. Also, the program exit that is wired to
punch repeat must be the same program exit that
is wired to
PUNCH on the Process Control Panel.
Digits or.couple exits used to impulse punch repeat must be
directed to the D
(digit) pickup for correct operation. As in the
case of the P pickup when the D pickup
of punch repeat has been
impulsed, the
OUT hub will emit just prior to punching time of
the second card.

5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22
o 5 10 15 OUTPUT
1111111111111111111111
40 45 50 55 60
1111111111111111111111
YI I I IYI1IIYI I I I 9f I
o 0 0
000000
45
o 0 0 0 0
o 0 0 0
50
r~---o--o--o--~--o--------o-I~--o--o-------
I~ 0 0 --0---0----- I~ --0--0---0----
r~--o---o----
-----------10-----------
~#\:
~i:!8 ~~8*-~
AC
AD
AE
AF
AG
AH
AJ
AK
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
fY-ll-1 -1 b-l q-l -1 1-q-1 1-11r~]=!=
1I1II I II 1I I1I I I lIn:: :::
- SIGN CONVERSION ---I N --Ir------------------------T
o 0:"1 0 0 0 0 0 s~ ~
3 OUT E CD
o c " 00000 Lo---L 2 k
00000000
65 70
00000000
65 70
II--COLUMN SPLlTS--12 - II 6 2 ..... :a ...... :
: : 0 0 0 ~-~2:: ::~:::
COMMON
o
75
o 0
75
o 0
80
o 0
Figure 4. 323 Punch Control Panel
More than one additional card can be punched by impulsing
Punch Repeat IN on successive punch cycles. The number of addi-
tional punch cycles can be controlled by the use of
pilot selectors.
Punch Repeat will maintain its proper status during error
restart procedures.
18. Half-After-Zero (0.5). This hub emits an impulse after
zero time but before one time. It may be used to transfer selectors
so that only the digits 1-9 are punched, or to separate the zone
and numerical punching
of alphabetic fields so that they can be
wired for DPBC detection.
19.
Pilot Selectors. Two groups of five 2-position pilot selec-
tors may be installed as a special feature.
If a program exit is wired through a communication channel
for the purpose of impulsing a pilot selector, the program exit
must be wired to the P EXIT pickup. Improper operation will
result if a program exit is wired to any other selector pickup.
When the P EXIT pickup is impulsed, the selector will transfer
immediately and will remain transferred for the duration of the
associated punch
cycle. The program exit that is wired to the
P EXIT pickup must be the same program exit that is wired to
PUNCH on the Process Control Panel.
It is possible to impulse the P EXIT pickup from a digit im-
pulse; however, if an output error should occur, the selector will
remain transferred throughout a run-out and run-in procedure.
On a run-out and run-in procedure the last punched card is
repunched on the run-in, and because the selector
would be trans-
ferred during the repunching of the last punched card, operations
such as split column control would not function properly.
The DELAY pickup may be wired from any digit impulse,
COUPLE, or from the Punch Repeat OUT hub. It cannot be im-
pulsed
by a program exit wired through a communication chan-
nel.
When the DELAY pickup is impulsed, the selector will trans-
fer one punch cycle later, and will remain transferred for one
cycle.
In the event of an output error, selector control will be
automatically maintained.
Associated with each pilot selector is a COUPLE hub. If a pilot
selector is transferred by impulsing the P EXIT pickup from a pro-
gram exit, the
COUPLE hub will emit just prior to punching
time for that card.
If a selector is picked up by impulsing the
DELAY pickup, the COUPLE exit will emit one cycle later just
prior to punching time.
If it is desirable to expand the number of available positions
REFERENCE SUMMARY 19

LOCATION
X, 1-40; AA,I-4O
AH,43
W, 1-40; Z,I-4O
A, 41-44
AG,43
AK,42
AJ,41-42
AK,43
AJ , 43
A-D,I-4O; E-F,1-20
AD,31-40
AC-AD, 41-44
T-U, 1-40
AH, 41-42
LOCATION
11.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
X, 1-40; AA,I-40
W, 1-40; Z,I-4O
AH,44
H, 31-40
G, 31-40
AC-AD,41-44
Q-Z, 41-44
Co-Selector ( Transferred)
Digit Selector
Common
S, 41-44
V, 1-40; Y, 1-40
AG,44
AK,41
AK,44
AJ,44
Pilot Selector PU ( Delay) AS, 31-40
Pilot Selector
PU ( Prog Exit) AC , 31-40
Pilot Selector ( Trans)
N-P, 1-40
Punch Repeat
IN ( Digit)
AF-AG,42
Punch Repeat IN ( Prog Exit)
AF-AG,41
Figure 5. 323 Punch Timing Chart
20 IBM RAMAC 30£;

of a pilot selector, the COUPLE exit may be wired to a co-selector
pickup. The co-selector will then function in the exact manner
as the pilot selector.
COUPLE may also be wired to the DELAY
pickup of another pilot selector to cause it to transfer one cycle
later.
Typewriter Control Panel (Figure 6)
1. Column Control Exits. When the typewriter is being used
for inquiries or for printing an auxiliary document, these hubs
seqeuentially emit impulses that coincide
with the reading of the
corresponding position
of the typewriter Q track. These impulses
control the format of the information being printed.
The first Q track position to be read is controlled by wiring the
Column Control Entry (item 13). Subsequently, the machine
reads succeeding positions until the control is transferred else-
where.
This arrangement allows the typewriter to type fields from
the typewriter track in any order.
If at any time the program unit or the column control delay are
turned on, the column control exits stop emitting,
but the same
sequential position
is held, unless the Column Control Entry
is impulsed to transfer control to another position.
When the
Program ON hubs are impulsed, column control is turned off
until Column Control
ON is impulsed. When Column Control
Delay
is impulsed, on the following cycle an impulse is emitted
from the
CCD hub, and then column control is turned on again
automatically.
2. Program Exits. When Program On is impulsed, these hubs
sequentially emit impulses when the typewriter
is being used for
inquiries or for printing an auxiliary document. These impulses
are used for typewriter control and to type constants, legends and
special characters
not on the typewriter track. Until the program
is turned off by impulsing Column Control On, the program
advances through steps 0-4 in levels A-E.
When the program is
first turned on after the final dropout of the previous operation,
Program Exit Ao will emit, followed by AI, A2, A3, A4, BO,
Bl, B2, etc. The program impulses may be started at another point
by impulsing Program Entries (item 12).
3. Digit Selector. It is sometimes desirable to know the con-
tents of a certain typewriter track position so that format control
may be altered on the basis of the character coding.
When the
PU hub is impulsed from a Column Control EXIT, the character
in that position is analyzed and emitted in IBM code from the
hubs labelled 12-9.
While this is taking place, the printing of
the character is suppressed.
4. CCD (Column Control Delay). When Column Control
Delay is impulsed, the CCD hubs emit an impulse that may be
used for spacing
or other functions. Column control is suspended
for the cycle on which these hubs emit. After one cycle, the
column control resumes from the step after the one on which the
control was impulsed (item
21).
5. Column Split (X-NX). When Column Split is impulsed
(item 24), on the next cycle column control is suspended and
either the X or
NX-hub will emit. The X-hub emits if the
character being analyzed by the column split device contained an
X-bit.
If no X-bit was present, the NX-hub emits.
6.
"0" TR (Zero Transfer). Whenever the zero transfer fea-
ture is turned on by impulsing Zero Sup On,
(Item 22), a zero
read from the typewriter track
is not printed, but an impulse is
emitted from these hubs. This impulse may be wired to Space
(Item 20) to maintain vertical column alignment.
7. 100
(Type 100). Impulsing these hubs causes all 100 char-
acters to be typed from the typewriter track, in position sequence,
without format control.
8.
Format. These hubs emit control impulses when the corre-
sponding format key is depressed on the keyboard. The impulses
from these hubs may be used to set selectors to establish format
control for three different types
of inquiries and to start the type-
writer control panel program.
9.
Type. When the TYPE hubs are impulsed on the process
control panel, the typewriter TYPE hubs emit an impulse that may
be used to control format for lines typed
out under stored pro-
gram control and to start the typewriter control panel program.
10. Selectors.
Ten 2-position selectors are. provided to facilitate
format control. Normally a connection exists between each
chub
and the N hub above it. When an impulse is wired to the PU hub
this connection is broken and the C hub is connected to the T hub
above it. This connection remains until the DO (dropout) hub is
impulsed.
11. Distributors. Impulses that are used to initiate several
functions are wired through distributors that serve the same
function
as split wires but prevent possible back circuits. An im-
pulse wired into the
IN hub of a distributor is available at the
associated OUT hubs, but impulses cannot travel between OUT
hubs, or from an OUT hub to the IN hub. Any impulse except that
from the OUT hub of another distributor may be wired through
a distributor.
12.
Program Entry (Also item 2). To establish the beginning
of a sequence of program impulses, one
LEVEL hub and one STEP
hub are impulsed in the same manner that the PROGRAM ENTRIES
are impulsed on the process control panel. The program unit is
turned on automatically
by impulsing Program Entry without
impulsing Program On.
13. Column Control Entry. To establish the beginning of a
sequence of column control (item
1), one TENS and one UNITS
hub are impulsed in the same manner that the PROGRAM ENTRIES
are impulsed on the process control panel. Column control is
turned on automatically by impulsing Column Control Entry
without impulsing Column Control On.
NOTE: Column Control Entry must not be impulsed at the
same time as Column Split.
14.
Type Only. When these hubs are impulsed from program
exits
or CCD, the corresponding characters are typed.
15. Clear. Impulsing these hubs causes the typing to stop and
the carriage to return.
16.
Column Control On. These hubs are impulsed to restore
the typewriter to column control after program control has been
used,
if it is desired to restart from the track position after the
last position used previously. Column control is turned on auto-
matically if a column control entry is made. Program control
is
turned off.
17. Program On. These hubs are impulsed to place the type-
writer under program control. Column control is turned off. Pro-
gram control is turned on automatically when a program entry
is made.
18.
Carriage Return. Impulsing these hubs causes the type-
writer carriage to return to the left margin.
19.
Tabulate. Impulsing these hubs causes the carriage to
tabulate to the next tab stop.
20. Space. Impulsing these hubs causes the typewriter to space
one space.
21.
Column Control Delay (Item 4). When these hubs are
impulsed, column control is suspended for one cycle, during
which an impulse is emitted from the
CCD hub (item 4). Column
control resumes control immediately after this cycle, continuing
from the column after the column that was wired to impulse
the delay.
REFERENCE SUMMARY 21