The opcodes contained in DirectCsound are not part of the Canonical Public Csound. DirectCsound is maintained by Gabriel Maldonado and available from:
http://web.tiscalinet.it/G-Maldonado/
They are included in the appendix for the convenience of those who use DirectCsound. If you experience problems with these opcodes or DirectCsound in general, please contact Gabriel Maldonado directly. The DirectCsound Appendix may or may not not be updated with the same frequency as the main manual. Check the URL above for the current version.