IBM 1130 User Manual page 216

Section
Subsections Page
30 20
I
00
02
IF(IN(22)-1) 3,4, 5
3
CALL MOVE (IN, 1, 27, IWK, 1)
C-----TypE ZERO CARD
PAUSE 3
etc.
The PAUSE number will be displayed in the
accumulator. Use of this technique will let you fol-
low the logic of the program (IFs and GO TOs) wi th-
. out severely slowing its execution.
5. Additional Print Lines. This technique is
sometimes called" selective tracing". Again, rather
than severely slowing the execution of a program and
printing the result of every replacement operation,
only selected variables and/or fields will be printed.
Use of the FORTRAN WRITE statement or the 1130
Commercial Subroutine Package PRINT subroutine
will allow you to follow the progress of variables
and/or fields as their contents change during pro-
gram execution.
6. Console Debugging. This technique should be
used only as a last resort.
It
involves manual in-
quiry into the system via the console switches, dials,
and keys. In most cases, the previously mentioned
techniques will provide you with all the information
necessary to debug.