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The POP command 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
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
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
1. Give the POP command to return to a higher level of the
TOPS-20 command processor (EXEC).
2. 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.
TOPS-20 Command processor 7(7)
THIS IS A TEST.
CPU time: 0.03 Elapsed time: 0:72