Int 21 Fn 4402  - DOS 2+ - Ioctl - Read From Character Device Control Cha  [D]

   AX = 4402h
   BX = file handle referencing character device
   CX = number of bytes to read
   DS:DX -> buffer

Return: CF clear if successful
       AX = number of bytes actually read
   CF set on error
       AX = error code (01h,05h,06h,0Dh) (see AH=59h)

Note:  format of data is driver-specific (see below for some specific cases)

See Also: AX=4400h,AX=4403h,AX=4404h,INT 2F/AX=122Bh