Did you get the main program structure working?
If it still acts funny, it's probably because the GOTO MAIN in the subroutines always goes back to the top of the program. Only SUB1 will get executed.
What about something like this?
Code:
GOTO MAIN ' Skip over subroutines
Sub1:
high portB.0
RETURN
Sub2:
high portB.1
RETURN
Sub3:
high portB.2
RETURN
MAIN:
GOSUB Sub1
GOSUB Sub2
GOSUB Sub3
END
I would recommend starting with Port B for your testing. You can use Port A later once you have a simple program working.
Robert
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