IBM 3774 Operating Procedure Manual page 79

Communication terminals
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7
Press the EOM key.
• The updated record transfers back to the diskette.
• Enter another record number if you need to update more than one diskette
record, and repeat Steps 5 and 6.
Note: With the AUTO switch on, the next diskette record (in sequence) transfers to the
controller buffer when you press the EOM key in Step 6. The numeric position readout
indicators display the diskette record number.
To exit from auto mode, but continue updating, turn the AUTO switch off after the
record you last updated transfers to the diskette; then continue at Step
5
of this procedure.
8
To exit from update mode, turn the UPDATE/MONITOR switch off.
9
To stop the job, after exiting from update mode, hold the CODE key down and
press the START JOB key.
Updating a Diskette Record During a Keyboard-to-Diskette Job
At any time during a keyboard-to-diskette job, you can update previously entered
records of a data set as follows:
1
Press the EOM key to write the record you are currently entering to the diskette;
if you do not press the EOM key, the data currently in the buffer erases when the
UPDATE/MONITOR switch is turned on (Step 2).
Note: The number of the record you would next write to the diskette displays in the
readout indicators.
2
Turn the UPDATE/MONITOR switch on.
3
Repeat Steps 5, 6, and 7 of the "Updating a Diskette Record" procedure
described above; do this for as many records as you want to update.
4
When you want to exit from update mode:
A. Turn the UPDATE/MONITOR switch off.
B. The number of the record you will next write to the diskette displays in the
readout indicators; you may continue the keyboard-to-diskette job.
Operation With Two Diskette Storage Devices
2-62
On terminals having two Diskette Storage Devices, the following will occur:
• When writing on diskette 1, and it becomes full, writing will automatically continue
onto diskette 2 (except for keyboard-to-diskette jobs).
• When reading all active data sets, diskette 2 will be automatically read after
diskette 1.
Listed below are some of the operations that can be performed on terminals with two
Diskette Storage Devices:
• All active data sets can be copied from diskette to diskette; inactive (bypass) data
sets are not copied. Data sets can be deleted by copying active data sets onto
diskette 2 and then clearing diskette 1.
• Data sets of the same name can be "pooled". If a data set of the same name exists
on both diskette I and diskette 2, data from the data set on diskette 1 is added to
the same data set on diskette 2.
• All segments of a data set can be collected and written as a data set with just one
label. When a data set with more than one label is copied to another diskette, the
result is a single continuous data set with one label.
• The second diskette can be used as an extension of the first. This is described under
"Multivolume Data Sets" in this section.
• A non-3770 diskette can be transmitted from diskette 2 to the central processor,
and response data written (received) onto diskette 1. The original diskette 2 data
is not altered.
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