X Figure 4-8.-Differences of the verifier

verification device. This key causes verifica-tion by comparing the card at the verifying station with a master card mounted on an auxiliary program drum.

44. MP-ER (multiple punch, error release) performs two functions. It prevents normal spacing of the card in order to verify two or more punches in one column. It also releases the keyboard when the keyboard becomes locked during a verifying operation. The keyboard is in numerical shift when this key is depressed.

Function Control Switches

Referring to figure 4-8, you will notice that the automatic skip and verify switch replaces the automatic skip and duplicate switch of the card punch.

The AUTOMATIC FEED SWITCH performs the same functions as the card punch except feeding is suppressed when an error card moves from the verifying station. This allows the

92

error card to stop between the verifying station and the reading station so that the correct infor-mation can be written on the card.

With the AUTOMATIC SKIP and VERIFY SWI'ICH turned ON, codes punched in the pro-gram card to control automatic skipping and verification (11 and 0) are effective. When turned OFF, the codes are nullified and these operations are suspended.

OPERATING PROCEDURES

The operating principle is the same as for the type 24 card punch, with the exception of the error routine. Errors may be committed either in the punching of a card or in the verifi-cation. Therefore, provision is made for three trials in the verification of a column. If an error is made while verifying, you have two more chances to depress the correct key. When the error light comes on, the following routine should be followed.

Chapter 4-CARD PUNCHES, VERIFIER, DATA'IRANSCEIVERS Figure 4-9.-Sensing pins of the verifier.

1. Depress the error release key to free the keyboard.

2. Make a second attempt to verify the column. If on this trial the card registers cor-rect, the error light goes out and verification can be continued. If it registers incorrect, the error light remains on and the keyboard becomes locked again.

3. Depress the error release key again.

4. Make a third attempt to verify the column.

At this time the light goes off and verification 93

can be continued in the next column whether the card is correct or not. If it is incorrect, the column is error notched. When it is evident that a character has been omitted, the skip key can be depressed in lieu of making the second or third attempt to verify the error column. The error column is then notched, the error light turns off, and the remaining portion of the field is skipped. (See fig. 4-10A.)

OPERATING SUGGESTIONS

The procedures to be followed for setting up a verifying operation are the same as for key-punching. Therefore some of the suggestions listed under keypunches, such as starting a punching operation and engaging the program sensing mechanism, apply equally to verifying.

Other suggestions for verifying are listed below.

Multiple Punch Verification

Two or more digits can be verified in the same column by holding down the multiple punch key while the digit keys are depressed one at a must be either verified or programmed to skip in order for the final OK notch to be cut. The card is not notched if released. Therefore, if a card is to be verified without program control, each column must be keyed, spaced, or keyboard will lock. The procedure for unlocking the keyboard and re-verifying the column is

ERROR NOTCH ON THIRD TRIAL

ERROR NOTCH

MACHINE ACCOUNTANT 3 & 2

SKIP KEY

IOloOOOOllOOIUIOOOIOOOOIOOtOIOIOJIDOOIOOOllOOlloOOOOOO00000000000000000000000000

1 2 J 4 5 ~; 8 9 10 11 12 13 :4 1516 17 18 1H 7Q 2~ n ,3 i4 25 26 17 282930 31 :2 3:'~; 1036 ::7 3839404' 42 4344454541 48495051 52535455565758596061626364656667686,7071 72 73 74 757677 767960

11 1 11111 1 1 1 1. 111 1 1 1 1 1 1 1 1 1 1·1 1 1 111 11 1 1 111 1 111 1 11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1. 1 1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 2222222222222222222122221122222222212222222222222222 2 2 2 2 2 2 2 2 2 2 222222222222222222 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 :j 3 3 3 31 3 3 3 3 3 3 3 3 3 3 3 3 3 3 313 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 33 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 44444444444444414444444444144444444444444444444444444444444444444444444444444444 555551515551555515551555555555555 5 ~l 5 5 5 5 5 5 5 5 515 5 5 5 5 5 5 5 5 5 5 555555555555555555555555 6661666666666666666661656666 [1 66 61 ~ 6 5 6 6 6 6 6 6666666666666666666666666 G F, 6 6 6666666 S 6 5 7 7 7 7 7 7 7 7 7 71 7 7 7 7 7 71·7 7 7 7 1 7 7 7 7 7 7 7 7 7 7 71 7 7 7 71 7 7 7 7 .1 7 7 7 7 7 7 7 7 7 7 7 7 7 1 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7

88888888S8S888888888888888888888d888888888888888888888 8888~888S88888e888888888B8

9 9 9 ~ 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 2 81 ^g 9 g 9 9 9 9 9 9 9 9 ~l q 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 ~ 9 g 9 9 9 ~ 9 9 9 9 9 9 9 S 9 9 9 9 9 9 9 9

1 2 3 4 5 G 7 8 910 11 12 13 14 1~ 16 17 18 192021 2223.242526,) 2g 19 3031 3Z 33 34 35363738 3l4C ·11 42 4344 ., 4647 'S '95051 52 53 ,~ 5; 0" 57 58 59 60 61 61 63 64 6~; 6, 01 68 !is 70 71 n 72 74 15 16 77 787980 fl'EMsOi3'i+]

A. ERROR CARD

IOIOOOOOllOOIOIOOOIOooomooOolOIOOIOoOIOOOllOOllOOOOOOO00000000000000000000000000

1 2 3 4 , 6 ) 8 9 10 11 12 13 1·1 15 16 17 1. 19 20 21 22 23 24 25 " 27 28 2S 30 31 32 .;3 34 3~, ::6 37 30HO 4' 42 4344 4546 47 48 49 50 51 525354 55 56 57 58 5960 61 62 83 64 65 6667 68 69 70 71 72 73 74 75 76 77 78 7S eo 1111111111111111111111111111111111111111111111111111111111111111111111111111111 i

22222222222221222221222211222222222122222222222222222222222222222222222222222222 3333333333333333333333133333333333333313333333333333 3 3 3 3 3 3 3 3 3 3333333333333333333 44444444444444414444444444444444444444444444444444444444444444444444444444444444

5555515155515555155515555~5555555555555555551555555555 55555555555555555555555555 6661566666666666666661666666666616 6 ~ 6 6666666666666666666666666666666666666666666 77777777771777777177777777777777771777717777777777777 7 7 7 7 7 7 7 7 7777777777777777777 88388888888fi8888888888888S888888888888888888888888888888888888888888888888888888 999 9 9 9 9 9 9 99 9 9 9 9 9 9 9 9 3 9999999199999999999999 9999999999999 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9

1 2 3 4 5 6 ) B ~ lQ 11 1113 :a 15 1617 18192021 22n 2'· 25 25 27 ;,8:'9303132333435363736394041424344454647 484S ,0" 525354 \5 ,6 57 56 535C 51.263646566616869107112 7314 7576 Ti 787980 WliJ-l!.[n

8. CORRECT CARD

Figure 4-10.-Verification notches.

~

FINAL OK . NOTCH

49.246X

Chapter 4-CARD PUNCHES, VERIFIER, DATA TRANSCEIVERS described under Operating Procedures. Other

locking of the keyboard may be caused by any one of the following situations:

1. When the main line switch is turned off and then on while a card is registered at the verifying station. The keyboard may be unlocked by depressing the release key.

2. When a card is registered at the verify-ing station, and the register key is depressed unnecessarily. This causes the feed and release keys to lock. They are unlocked either by de-pression of a character key, the space bar, or the error' release key.

3. When a card is registered at the verify-ing station, and the feed key is depressed un-necessarily. This causes the register and release keys to lock. They are unlocked either by depressing a character key, the space bar, or the error release key.

DATA TRANSCEIVERS

Data transceivers may be employed in any situation which calls for rapid transmission of punched card data between activities physically removed from each other. This data may be transmitted either by telephone or telegraph lines. As a Machine Accountant you may be

COVER OF SIGNAL UNIT CONTROLS AND INDICATORS

SIGNAL UNIT

aSSigned to duty in an installation which has data transceivers, such as a Personnel Account-ing Machine Installation, designed to send punched card data over telephone lines to other locations containing data transceivers, and to receive data from other locations by the same method. An example of such data exc~ange is the transmission of data to the Bureau of Naval Personnel on personnel that are due for trans-fer from sea duty to shore duty and the receiv-ing of assignment data from BuPers for use by the local personnel distributor concerned.

Because the transceiver is designed to send as well as receive, only one machine is required at each station to provide data exchange in both directions.

PRINCIPLES OF OPERATION

The IBM 66 data transceiver (illustrated in fig. 4-11) is a modified card punch, which is cable connected to a signal unit. When the transceiver is set to transmit, the card unit reads a card one column at a time, much as the standard card punch performs duplication, and sends the data to the signal unit. The Signal unit then converts the punched holes to electrical impulses which can be sent along a

POWER SWITCH CONTROL UNIT

49.247X Figure 4-11.-IBM 66 Data transceiver and signal unit.

95

MACHINE ACCOUNTANT 3 & 2 trans-ceiveris set to receive, the signal unit receives the electrical impulses from the telephone or telegraph line, converts them to punched card codes, and sends the codes to the card unit for punching. (See fig. 4-12).

SIGNAL UNITS

Since punched holes as such cannot be trans-mitted over communication lines, they must be converted to electrical impulse fl. This is the job of the signal unit. While one type of unit is used for transceiving over telegraph lines, another type is required for telephone lines.

Telegraph Signal Unit

Over telegraph lines, only one transmission can be made per line. The speed of transmission is controlled by a pluggable speed selector in the Signal unit. Either one of three different speed selectors may be used, depending upon the class of service available. The number on the handle of the speed selector in the trans-mitter must match the one in the receiver.

Telephone Signal Units telephone channel into four transmission chan-nels. They operate in the center of a 500-cycle

number. This two-digit number is engraved on the handle of each selector to identify the chan-nel number, and to indicate whether the selector will work with a 2-wire or a 4-wire telephone circuit.

Telephone lines are available in either 2-wire or 4-2-wire terminations. If a 4-wire signal unit is furnished, it can be used on a 2-wire telephone line by the insertion of a 2-wire chan-nel selector. If a 2-wire signal unit is furnished, it must be modified to operate on the 4-wire telephone lines. In order to distinguish between the 2-wire and 4-wire channel selectors, the following numbers are designated for each fre-quency: arranged for automatic operation. Since it does not contain a keyboard, additional data cannot be entered into a card as it is being transmitted or received. Operation of the card unit is per-formed on a small control unit. Aprogram unit is also provided to control the transceiver functions.

The POWER SWITCH is located on the left front panel of the card unit under the reading board. This switch supplies power to thema-chine, and must be ON for all machine operations.

The STAC KER switch is located at the rear of the stacker, in the same position as the main line switch on card punch machines. This

Chapter 4-CARD PUNCHES, VERIFIER, DATA TRANSCEIVERS switch turns off automatically and stops

trans-ceiver operation when the stacker is filled.

Control Unit

The control unit, which is cable connected to the card unit, may be positioned at any desired location on the reading board. The operating , switches, keys, and lights are illustrated in figure 4-13, and described as follows:

Print Switch. -Some card units are equipped with a printing feature, which allows for print-ing information across a card as it is beprint-ing received. When the switch is turned on, print-ing is controlled by the program card. When turned off, all printing is suppressed.

Transmit-Receive Switch.-This switch con-trols transceiver operation. As transceivers are always used in pairs, the transmitter must have this switch set to TRANSMIT, and the receiver to RECEIVE.

Interlock Key.-This key must be depressed before either the TEL or END-OF-TRANSMIS-SION key can be operated. When the transceiver is operating, the interlock key must also be used with the release key. This interlock is provided to prevent accidental operation of any of the other keys.

Tel Key.-This key is depressed, along with the interlock key, to request the operator at the other end of the line to change from transceiver operation to telephone communication. Both operators can then operate the switches pro-vided for alternate service, causing the trans-ceivers to remain idle until both switches are again turned back to transceiver operation.

The tel key should be depressed only when cards are not being transmitted. Depression of this key lights the tel light on both machines, turns out both start lights, and rings their buzzers.

End-of-Transmission Key.-This key is de-pressed, along with the interlock key, when transmitting is completed. Depression of this key lights the end-of-transmission light on both machines, to signal that .transmitting is com-plete. This key may also be used to indicate the end of a group of cards so that the operator at the. receiver can change program cards or take any other action required. Depression of this key at either machine will turn off the start lights on both machines and ring their buzzers.

Reset Key.-Depression of the reset key at either the receiver or the transmitter turns off the buzzer, the tel light, and the end-of-transmission light. Depression of the interlock

97

49.7X