NAME
	SubTime -- Subtract one time request from another.

   SYNOPSIS
	SubTime( Dest, Source )
	         A0    A1

	void SubTime( struct timeval *, struct timeval *);

   FUNCTION
	This routine subtracts one timeval structure from another.  The
	results are stored in the destination (Dest - Source -> Dest)

	A0 and A1 will be left unchanged

   INPUTS
	Dest, Source -- pointers to timeval structures.

   NOTES
	This function may be called from interrupts.

   SEE ALSO
	timer.device/AddTime(),
	timer.device/CmpTime()

   BUGS