Stopping Or Interrupting A Program; Programming A Stop Or Pause (Stop, Pse); Interrupting A Running Program; Error Stops - HP 33s User Manual

The display is cleared by other display operations, and by the RND operation if
flag 7 is set (rounding to a fraction).
º ¤
Press to enter PSE in a program.
The VIEW and PSE lines — or the equation and PSE lines — are treated as one
operation when you execute a program one line at a time.

Stopping or Interrupting a Program

Programming a Stop or Pause (STOP, PSE)

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Pressing
This will halt a running program until you resume it by pressing
keyboard. You can use STOP rather than RTN in order to end a program
without returning the program pointer to the top of memory.
º ¤
Pressing
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
program completes its current instruction before stopping. Press
resume the program.
If you interrupt a program and then press
cannot resume the program with
label ) .

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.)
( run / stop ) during program entry inserts a STOP instruction.
during program entry inserts a PSE (pause) instruction.
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