From Bde:

From Bde:
	o Removed references to TS_WOPEN (the one for hanging up was
	  simply wrong for case of TS_WOPEN and TS_ISOPEN set (aborted
	  open clobbers successful open, and TS_ISOPEN unset more or
	  less corresponds to TS_WOPEN set).
	o Unique name for sleep address ("comdcd" not ttopen[]).
	o Use tsleep() instead of ttysleep().  Neither is quite right
	  (revoking of tty for another open() shouldn't cause incomplete
	  open to fail; comopen() should reinitialize after sleeping
	  unless port is already open).
	o Use ttwwakeup() to handle write-wakeups consistently.
	o Removed comselect().  It just duplicated ttselect().