At least on the MacIIvi (but I suppose on all machines that use the
Egret chip) there is a  one second timer tick  which comes directly from
the RTC (see macrom.c).
I would think that it much more unlikely to loose the 1 second tick than
loosing the 1/60 second ticks because interrupts wont be disabled for
that long, I hope.

Can anyone think of an idea to combine both ticks so that we still have
a good resolution but don't loose ticks?

  Ciao 
    Walter
-- 
EMail: walter@ghpc8.ihf.rwth-aachen.de   | SnailMail: Walter Ruetten
                                            _o        Turmstr. 190
Phone: ++49 241 807945                   _`\_<,       52064 Aachen
Fax  : ++49 241 8888213                 (*)/'(*)      Germany
  "History --- an agreeable set of untruths"  -- Powhiri Rika-Heke