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SET DDT BREAKPOINT Command
The SET DDT BREAKPOINT command enables the DDT breakpoint
facility. If the breakpoint facility is on and if DDT is loaded
with the program, you can type CTRL/D to interrupt program
execution and use DDT to examine the state of the program. When
the facility is turned off, CTRL/D is passed to the program.
SET DDT BREAKPOINT argument
Where: the word BREAKPOINT may be omitted.
argument may be ON, OFF, or omitted. If the argument is
omitted, SET DDT reports the breakpoint status without
Leaves your terminal at user level.
Does not destroy your core image.
Note that CTRL/D is meaningful only to DDT and VMDDT. It will
not have this effect on programs loaded with a compiler-specific
debugger like FORDDT.
Enable the DDT breakpoint facility.
.SET DDT ON<RET>
[Control-D breakpoint facility is turned on]
Debug a MACRO program that increments and prints a number, once
per second. Use the DDT command $G to start program execution.
Then type CTRL/D to stop the program and examine the current
location with DDT. Then type $P to continue execution. Use
CTRL/Z to exit to monitor level. Note that CTRL/D is shown here,
although it does not echo on your terminal.
[LNKDEB DDT execution]
This program will increment a count, once per second.
$0B>>LOOP#+12/ JRST LOOP# $P
$0B>LOOP#+1/ SLEEP 1, ^Z