/START_POSITION
       /NOSTART_POSITION (default)

    Controls whether the /START_POSITION qualifier is appended
    to the specified or default command line when you enter the
    EDIT command. Currently, only DECTPU and the DEC Language-
    Sensitive Editor (specified as TPU or /CALLABLE_TPU, and LSEDIT
    or /CALLABLE_LSEDIT, respectively) support this qualifier.

    The /START_POSITION qualifier affects the initial position of
    the editor's cursor. By default (/NOSTART_POSITION), the editor's
    cursor is placed at the beginning of source line 1, regardless
    of which line is centered in the debugger's source display or
    whether you specify a line number in the EDIT command. If you
    specify /START_POSITION, the cursor is placed either on the
    line whose number you specify in the EDIT command, or (if you
    do not specify a line number) on the line that is centered in the
    current source display.