INT 15 - Olivetti Quaderno - WRITE LCD
        AX = 44C7h
        DX = hex display
            FFFFh display clock and "HI", "Md", or "Lo"
                BH,BL,CL unused
            other: display specified hex number in first four positions
                BH = left alphanumeric character on display (see AX=44C6h)
                BL = right alphanumeric character on display (see AX=44C6h)
                CL = flags
                    bit 0: right colon on
                    bit 1: left colon on
                    bits 2-7 unused
Note:   this function is also supported by XBIOS.COM
SeeAlso: AX=44C6h

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