TOPS-20 Commands Reference Manual
Terminates the current level of TOPS-20 and returns you to its superior process.
@POP (COMMAND LEVEL)
POP the Opposite of PUSH
You can do one and only one POP command for every previous PUSH command. Giving too many POP commands will cause an error message to be printed on your terminal.
Job Parameters Affected by POP
As soon as you complete a valid POP command at some level of TOPS-20, you give up the copy of memory for that level of TOPS-20 and any program you were running. Any defaults established at that level (such as default filespecs for LOAD-class and EDIT-class commands, defaults specified by SET DEFAULT commands) are cancelled as well. If POP returns you to a higher level of TOPS-20, all these parameters revert to any values established at that higher level.
Returning to Other Programs With POP
The POP command usually returns you to the level of TOPS-20 from which you gave a previous PUSH command. But a few system programs such as PTYCON and OPR, also allow you to give PUSH to get a new level of TOPS-20. Giving the POP command to this level of TOPS-20 returns you to that program.
Effect on Memory and Terminal
The POP command clears memory, terminates the current level of TOPS-20, and returns your terminal to the previous TOPS-20 command level (but see Special Cases, above). Memory for the previous TOPS-20 command level is not affected by this action.
|CONTINUE||for resuming execution of a program in memory|
|INFORMATION SUPERIORS||for information on the number of forks that are superior to the current EXEC level|
|PUSH||for obtaining a new level of TOPS-20|
- Give the POP command to return to a higher level of the TOPS-20 command
- Run a program and halt it with CTRL/Cs. Give a CONTINUE STAY command
to resume its execution, and then the PUSH command for a new level of
TOPS-20. Run another program at this lower level, then use the POP command
to return to the first level; in this case you return before receiving the
final message of the first program.
@RUN DMN ^C @CONTINUE /STAY @PUSH TOPS-20 Command processor 7(7) @RUN TESTF1 THIS IS A TEST. CPU time: 0.03 Elapsed time: 0:72 EXIT @POP EXIT