IBM 3742 Reference Manual page 28

Figure 17. 3741 Keyboard (Mod el 1)
COPY: Use this key simultaneously with NUM SH I FT to
perform the disk copy functions.
DASH: Use this key in a numeric right adjust f ield instead
of the right adjust key to insert a negative sign in the units
position of the field, in addition to performing the right
adjust function .
DISK 2 REC ADV: Use this key to read the next sequen-
tial record from disk 2 or to perform search operations on
disk 2. This key is invalid when the disk is positioned at
track ~O, sector 26. If a disk 2 record advance is the first
disk 2 operation after the second disk has been inserted,
the data set label at track
~O,
sector 08 is displayed . An E
alert is displayed if this key is pressed when already at the
last record of the data set . All disk 2 record advance
operations end with the disk 2 address displayed and the
cursor in position 1 of the record.
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DISK 2 REC BKSP: Use t his key to read and display the
previous record from disk 2. The disk 2 record backspace
operation ends with the disk 2 address displayed and the
cursor at position 1 of the record. If a disk 2 record back-
space is the first disk 2 operation after the second disk has
been inserted, the data set label at track ~O, sector 08 is
displayed.
DISK 2 RETURN TO INDEX: Use this key to read and
display the data set label associated with the current data
set on disk 2. If a disk 2 return to index is the first disk 2
operation after the second disk has been inserted, the data
set label at track ~O, sector 08 is d is played .
DISPLA Y DA TA: Use this key to
display the data in the
current record.