INT 14 - I1541 - RECEIVE A BYTE FROM A DEVICE                                   
	AX = 400Bh
Return: CF clear if successful
	    AL = byte received
	    CL = last-byte flag
		00h more bytes to follow
		01h received byte is the last
	CF set on error
	    AL = error number
		80h EOI(End of Interrupt) A particular command sent to the interrupt controller to indicate that the interrupt has been handled by software and that new interrupts of the same or lower priority may now be signalled by the interrupt controller. response required
		81h talker not ready
		82h clock not set
		83h clock not released
	    CL = 00h
SeeAlso: AX=4000h,AX=400Ah