private function _writeCodepage()
	{
		$record          = 0x0042;             // Record identifier
		$length          = 0x0002;             // Number of bytes to follow
		$cv              = $this->_codepage;   // The code page

		$header          = pack('vv', $record, $length);
		$data            = pack('v',  $cv);

		$this->_append($header . $data);
	}