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IBM 3741 Operator's Manual page 76

Data station
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Record Insert
Use this feature to open spaces (sectors) within a data set
so records can be added. Space for up to 99 records can be
created. To do this, the 3741 moves all records starting with
the record currently being displayed through the last record
in the data set. The records are moved, toward the end of
extent, as many sectors as the number of records being in-
serted.
After moving the records, the 3741 fills the vacated space
with deleted records, The deleted records are identified by
a D in position 001 and an \ (inverse slash) in position 002.
The new EOD address, in the data set label, is updated when
the 3741 returns to the Index (X) mode.
66
How To Insert Records
·1.
2.
3.
4.
Position the disk at the address of the record you want
moved forward, to allow for inserting records. (If in
Verify (V) mode, press FUNCT SEL lower and UP·
DATE.)
Press FUNCT SEL lower and SEARCH ADDRESS.
Key in a two-digit number (01-99) indicating the
number of records to be inserted.
Press FUNCT SEL lower and RIGHT ADJ. The
machine mode changes to N, the status changes to W,
and the display is blanked. When all the records are
moved and the space is filled with deleted records, the
machine returns to the disk address of the first deleted
record, posts a 6 error, goes to program level 0 and
Update (U) mode.
5.
Press NUM SHIFT with RESET to remove the error
condition.
6.
Key the records you want to insert over the deleted
records.
7.
Press FUNCT SEL lower and RETURN TO INDEX.

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