INT 21,44,7 / IOCTL,7 - Get Output Status

	AH = 44h
	AL = 07
	BX = handle


	on return
	CF = 0 if successful
	   = 1 if error
	AX = error code if CF set  (see DOS ERROR CODES)
	AL = 00  if ready (files), or not ready (char devices)
	   = FF  ready (files or char device)


	- indicates if a device or file is ready for output
	- files always return ready, character devices don't