

                    RUN-TIME ERRORS IN OVERLAYS
                    ---------------------------
     Run-time errors occurring in overlays are found as usual,
and an address is issued by the error handling system.  This
address, however, is an address within the overlay area, and
there is no way of knowing which overlay subprogram was actually
active when the error occurred.
     Run-time errors in overlays can therefore not always be
readily found with the Options menu's 'Find run-time error'
facility.  What 'Find run-time error' will point out is the first
occurrence of code at the specified address.  This, of course, may
be the place of the error, but the error may as well occur in a
susequent subprogram within the same overlay group.
    This is not a serious limitation, however, as the type of
error and the way it occurs most often will indicate to you in
which subprogram the error happened.  The way to locate the error
precisely is then to place the suspected subprogram as the first
subprogram of the overlay group.  'Find run-time error' will then
work.
     THE BEST THING TO DO IS TO NOT PLACE SUBPROGRAMS IN OVERLAYS
UNTIL THEY HAVE BEEN FULLY DEBUGGED!