Function 440Ch /4ah     Select Code Page                             DOS 3.3+

    Selects the code page used by the specified device. The code page
    must be in the list of prepared code pages for the device.

        Entry   AX    = 440Ch
                BX    = Device handle
                CH    = Device category:
                        | 01h   Serial device
                        | 03h   Console (screen)
                        | 05h   Parallel printer
                CL    = 4ah
                DS:DX = Pointer to a CodePage structure

        Return  AX = Error code, if CF is set
                     | ??