Displaying A Program; Modifying A Program; Program Chaining - IBM 3742 Reference Manual

Field Definition
Characters
Keyboard
Shift Meaning
Any 8 field followed
by
4, 5,
or
6
Field totals readout field
Any 8 fieI'd followed
by 7, 8, or 9
Field totals readout and reset field
Figure 19 (Part 2 of 2). Field Definition Characters
Keyboard
Character Shift
Meaning
- (dash)
Numeric
Continuation character
for numeric fields
. (period)
Alpha
Continuation character
for alphameric fields
E
Not applicable
Indicates the end of
the program
Figure 20. Additional Character Codes
DISPLAYING A PROGRAM
On the 3741 the program in control can be displayed on
lines 2, 3,4, and the first eight positions of line 5 on the
screen by pressing FUNCT SEL lower and DISPLAY PROG.
On the 3742, only lines 2 and 3 can be used for program
display.
To display the field in the program being processed in the
last 30 positions of line 5 on the display screen, press
FUNCT SEL upper and the DISPLAY FIELD PROG. If
the field is longer than 30 characters, only the first 30
characters of the field are displayed.
MODIFYING A PROGRAM
To modify an existing program, press FUNCT SEL lower,
ALPHA SHIFT or NUM SHIFT, and DISPLAY PROG.
The current program is then placed in the current record
buffer and program level 0 is selected. The program can
now be modified by keying. To reload this program,
follow the standard reloading procedure. I n verify or field
correct mode, this procedure gives an M error.
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PROGRAM CHAINING
Program chaining is used where records having different
formats are being processed in sequence and corresponding
programs are to be selected automatically. The next program
is to be selected when record advancing is indicated by the
appropriate program number in position 80 of the current
program for 3742 and position 128 for 3741 or 3742
with the 128 feature. When record backspacing, the pro-
gram number is indicated in position 79 of the current
program for 3742 and position 127 for 3741 or 3742 with
the 128 feature. The program selection occurs at the
termination of the current record.
Acceptable characters for program chaining are numbers
o
through 6 for 3742 and 0 through 9 and hex FA
(corresponding to program level A) for 3741 and 3742 with
128 feature. If the program chaining characters specified
are part of the programmed field, the characters are treated
as numeric continuation characters.
If program chaining is used on the 3741 with the field totals
feature, there must be at least one field continuation charac-
ter between the field definition character and the chaining
characters. Otherwise the chaining characters will be inter-
preted as field totals characters in addition to performing
their chaining function.