It does not matter if a system is old or not, you gotta keep it up to
date.  "Maintenance programming" means adding LOCKED clauses that
should have been there in the first place.  I doubt it would take more
than a few hours; probably less time than writing and debugging some
off-the-wall input timer routine.  There probably aren't that many
critical READU's.  On my system, for the number of programs I have in
the system, I only have a third as many READU's.
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