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How to Select a Card Read/Punch Program
Card read/punch programs are loaded the same way key
entry programs are loaded (see
How to Load a Program).
Note: Program storage area A is used for program selection
control, and program storage area 9 is used as an input/out-
put buffer.
For formatting instructions, see the
IBM 3741 Dara Station
Reference Manual,
GA21-9183.
If the card read/punch program selection is automatic, you
are not required to select the program. If the card read/
punch program is manually selected, you must select the
program prior to initiating the card read or punch operation.
To do this:
1.
Press SEL PROG.
2.
Key in the program storage area number (·1 through 8)
you want to use for keying. The program you se-
lected is now active.
138
Notes:
1. Program storage area A specifies which program
storage (format control) area is used for card read or
punch operations when a keying program storage area
is selected.
2. If the 3741 is programmed so that it is waiting for the
operator to key and yet is still under format control
of a card read or punch program, the operator must
select a key entry program before keying data. Failure
to do this could result in loss of data.
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