INT 14 - COURIERS.COM - SEND BREAK                                              
	AH = 8Ah
Return: nothing
SeeAlso: AH=89h"COURIERS",AH=FAh
                                                                                

INT 14 - COMM-DRV v14.0 - TURN OFF RTS                                          
	AH = 8Ah
	DX = port number
Return: AH bit 7 set on error
	AH bit 7 clear if successful
SeeAlso: AX=8000h"COMM-DRV",AH=88h"COMM-DRV",AH=89h"COMM-DRV"