The m command toggles modal trapping on and off.
m
A modal trap occurs whenever an external subroutine is called, returned from, or when a mainline program enters another mainline program. In response to the modal trap, type the m command to toggle the modal trap ON or OFF depending on the trap’s previous state.
When a modal trap occurs, it will be indicated by entering the BASIC debugger (*), and one of these prompts appears:
| *MCxxx | Indicates the modal trap was caused by a CALL statement. xxx indicates the source code line number in the entered program (should be line 1). |
| *MRxxx | Indicates the modal trap was caused by a RETURN from the called subroutine. xxx indicates the source code line number in the calling program where the return occurred. |
| *MExxx | Indicates the modal trap was caused by an ENTER statement. xxx indicates the source code line number in the entered program (should be line 1). |
In response to the previous modal traps, type the m command at the * prompt to toggle the modal trap ON or OFF. While in this mode, using the g command will resume execution until the next modal trap occurs.
Example 1
This example shows one main program calling a subroutine:
main
001 debug
002 print "calling sub"
003 call subr
004 print "returned from sub"
subr
001 subroutine subr
002 print "in the sub"
003 return10
Example 2
This example shows program execution showing modal trapping on:
:main *I1 *m on *g calling sub *MC subr 1 *g in the sub *MR main 3 *g returned from sub :