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Section 4: Programming 2 76
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Miscellaneous Program Topics
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Program Debugging
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lncluding Temporary Stops. Where space permits it is advisable to include additional
R/S operations in long programs to display intermediate results while writing and checking the
program. When the program is finally checked out, the unwanted stops can be deleted.
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Single Stepping. When switched to RUN mode, SST executes the program, one step
at a time. You can observe the effect of your program in slow motion. To single step through a
top row key function in a program, first press GTO followed by A, . . . , E, then
press SST, repeatedly. However, the RTN the end of the function will be ignored.
(Also see Figure 4-2.)
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Numerical Examples. It is usually necessary to work out a sample problem by
independent means and then to do the same calculation using your program.
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Magnetic Cards
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Prerecorded Cards. Now that you have seen how programs work you can understand that
the answers to the following question depends on the program:
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“During a program stop, can I use the stack, the other registers, the flags, etc?”
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It is safest to follow the printed procedures when using the prerecorded programs. Departures
should not be made without studying the program listing in detail.
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Read/Write Operations. Reading or writing a card does not change the contents of
the registers. A program can utilize data developed by a prior program. Whenever a magnetic card
is written or read, all 100 steps are transferred. In most cases, the display will blink and
program memory will be cleared to gNOP codes if a read operation fails. Reading a blank card
will have the same effect.
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