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  Description:  Write File or Device
 
  Given a valid file handle from a previous open or create operation, a
  buffer address, and a length in bytes, transfers data from the buffer
  into the file and then updates the file pointer position.
 
  Input                                     Output
  ══════════════════════════════            ══════════════════════
  AH=40H                                    If function successful
  BX=handle                                 Carry Flag=clear
  CX=number of bytes to write               AX=bytes transferred
  DS:DX=segment:offset of buffer            Carry flag=set
                                            AX=error code
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