DOS Fn 440cH CL=65H: IOCTL Query Retry Iteration Count

                                                         Compatibility: 3.3+ 
 Expects: AX    440cH
          BX    file handle  (device or disk file)
          CL    65H
          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 16-bit word to receive the current retry count.
 Returns: AX    error code  if CF is set to CY
          DS:DX buffer contains the retry count (if no error)
    Info: Sets the number of times the device driver should try to send
          output to the device before assuming that the device is busy.

          DS:DX points to a 2-byte buffer.  Upon return, the buffer
          contains the current 16-bit retry count.

   Notes: ■ This is used only for printer drivers that support "Output
            until Busy".  See Device Requests.

          ■ This setting is global.  Before changing it (via, 440CH 65H),
            you should use this fn to obtain the current value.  Change it
            back before exiting.

See Also: Fn 44H (IOCTL)
          Fn 440cH (generic IOCTL for character devices)
          Fn 440cH 45H (set retry iteration count)
          Generic IOCTL Data Packets
          Device Drivers
          DOS Functions