INT 4A - TI Professional PC - KEYBOARD - INSERT CHARACTER INTO KEYBOARD BUFFER

	AH = 05h
	BX = character code (BH=00h if ASCII character, BL=00h/BH nonzero for
	      extended codes) (see #03214)
Return: ZF set if keyboard buffer was already full
	ZF clear if keystroke inserted into buffer
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 5B"TI"