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Simple Programming 13-19
Stopping or Interrupting a Program
Programming a Stop or Pause (STOP, PSE)
Pressing (run/stop) during program entry inserts a STOP instruction. This
will display the contents of the X-register and halt a running program until you
resume it by pressing
from the keyboard. You can use STOP rather than
RTN in order to end a program without returning the program pointer to the
top of memory.
Pressing
during program entry inserts a PSE (pause) instruction.
This will suspend a running program and display the contents of the X–
register for about 1 second — with the following exception. If PSE
immediately follows a VIEW instruction or an equation that's displayed (flag
10 set), the variable or equation is displayed instead — and the display
remains after the 1–second pause.
Interrupting a Running Program
You can interrupt a running program at any time by pressing or . The
program completes its current instruction before stopping. Press
(run/stop) to
resume the program.
If you interrupt a program and then press
, , or , you cannot
resume the program with
. Re-execute the program instead ( label line
number).
Error Stops
If an error occurs in the course of a running program, program execution halts and
an error message appears in the display. (There is a list of messages and conditions
in appendix F.)
To see the line in the program containing the error–causing instruction, press
. The program will have stopped at that point. (For instance, it might be a ÷
instruction, which caused an illegal division by zero.)