Changing One Instruction - HP -33E Owner's Handbook Manual

72 Program Editing
Keystrokes Display
(9 03- 61 Holding down in RUN
mode displays the previous
instruction.
314.1593 Releasing the key
displays the original
contents of the X-register.
02- 15 73 Again holding down
displays the previous line in
program memory.
314.1593 And releasing displays
the original contents of the
X-register again.
If you now switch to PRGM mode the second line will be displayed.
02- 15 73
Cued Stops. If you have a program that is halted several times during
execution for data entries, you may want to ''identify'' each stop by
recording a familiar number into the program just before each
instruction. Then when the calculator stops execution because of the
instruction in the program, you can look at the displayed X-register
to see the ''identification number'' for the required input. For example,
if your program contains eight stops for data inputs, it may be helpful
to have the numbers 1 through 8 appear so you know which input is
required each time. These identification numbers are helpful in editing
a program.
If you key in data after the program has stopped running, remember that
resuming program execution terminates digit entry.
Changing One Instruction
Changing or correcting one line of your program is easy with your
calculator because of the features built into it. Once the error has been
found, use , , or . nn in PRGM mode or in RUN
mode to display the line preceding the line to be changed. For example,