Log Message:
   Leave modem control lines in correct state on interrupted open.
   (From sparc/dev/zs.c)

is there some way we can put the common code in these two
zs.c's (and any others?  does the amiga use it?) in a
common place?  i've seen so many of these messages go by
so far, and it's scary to think what has been missed  :-).

maybe if it is sun hardware specific, sys/dev/sun ?