INT 15 - Olivetti Quaderno - READ LCD
        AX = 44C6h
Return: DX = FFFFh clock is displayed on LCD display
        DX = other: hex number displayed in first four positions of display
        BH = left alphanumeric character on display (see below)
        BL = right alphanumeric character on display (see below)
        CL = flags
            bit 0: right colon on
            bit 1: left colon on
            bits 2-7 unused     
Notes:  the LCD display has the format HH:HH:AA, where H is a hex digit and A
          is an alphanumeric character
        this function is also supported by XBIOS.COM
SeeAlso: AX=44C7h,AX=44C9h

Values for alphanumeric characters:
 00h-0Fh hex digit
 2Bh    "+"
 2Dh    "-"
 30h-39h "0" to "9"
 41h-5Ah "A" to "Z"
 61h-6Ah "a" to "z"
 else   blank

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