INT 14 - I1541 - SEND SECONDARY ADDRESS FOR TALK                                
	AX = 4008h
	BL = channel number and mode (see #00355)
Return: CF clear if successful
	CF set on error
	    AL = error number (see also #00354)
		40h turn around time-out
SeeAlso: AX=4007h,AX=4009h