waitkb(itype.i2.r, irow.i2.r, icol.i2.r, nsecs.i2.r)
	This routine will flush any non-empty buffers for the TV's, LX or SS 
	and wait NSECS seconds for the next keyboard or terminate interrupt.
	When a keyboard interrupt is detected, a terminate interrupt is 
	detected, or the timeout expires, control will be returned to the 
	caller.  (If NSECS is LE 0, the routine will never timeout.)
	ITYPE, IROW, and ICOL will be set to the interrupt type, cursor row 
	and cursor column (from the INTYPE routine).