I²C alphanumerical display

Most alphanumerical LC display units lack an integrated PC interface. Fortunately, this problem is readily solved with the aid of an I²C-compatible interface described here. In addition to describing this clever bit of hardware, we take the opportunity to present an extension to the existing I²C software (in Turbo Pascal), that makes putting text on to an LCD just as easy as writing to PC files, or to the screen.