DOS Fn 440cH CL=6BH: IOCTL Query Code Page List

                                                         Compatibility: 3.3+ 
 Expects: AX    440cH
          BX    file handle  (device or disk file)
          CL    6BH
          CH    device category: 00H=unknown
                                 01H=COMn (DOS 3.3+)
                                 03H=console (screen + keyboard) (DOS 3.3+)
                                 05H=parallel printer (DOS 3.2+)
          DS:DX addr of a buffer to hold an IoctlCpListRec structure
 Returns: AX    error code  if CF is set to CY
          DS:DX buffer is filled with IoctlCpListRec data (if no error)
    Info: Obtains the list of currently-prepared code pages for the
          specified device.

          Code pages in this list may be activated via fn 440CH 4aH.

   Notes: ■ See fn 440CH 4cH and National Language Support for related

          ■ Use fn 440CH 6aH to obtain the ID of the current active code
            page for a device.

See Also: Fn 44H (IOCTL)
          Fn 440cH (generic IOCTL for character devices)
          Generic IOCTL Data Packets
          National Language Support
          DOS Functions