Compatibility: 3.3+
Expects: AX    440cH
BX    file handle  (device or disk file)
CL    6aH
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 buffer to hold an IoctlCpIdRec structure.
                                                                  
Returns: AX    error code  if CF is set to CY
DS:DX buffer is filled with IoctlCpIdRec identifying current cp
                                                                  
Info: Query a driver to see what code page is currently active for that
device.

See Also: Fn 44H (IOCTL)
Fn 440cH (generic IOCTL for character devices)
Fn 440cH 4aH (select code page)
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DOS Fn 440cH CL=6AH: IOCTL Query Current Code Page