INT 2F U - DOS 3.3+ DISPLAY.SYS internal - GET ACTIVE CODE PAGE
        AX = AD02h
Return: CF set if code page never set
            AX = 0001h
            BX = FFFFh (assume first hardware code page)
        CF clear if successful
            BX = current code page
SeeAlso: AX=AD01h,AX=AD03h

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