Thanks for the useful links. I have read most of these before but it was worth reading them again.
I wish to concentrate upon AFP only for the time being.
The page at http://lowendmac.com/2018/macs-sharing-files-with-other-macs-old-or-new/ implies that:
1 - Mac OS 9.0 to 9.2.2 support connections up to Leopard and
2 - Mac OS X 10.4, 10.5, and 10.6 support connections to Mac OS 9.0 or later.
This is not inconsistent as it depends upon which Mac makes the connection.
The above is supported by the AFP table at http://www.applefool.com/se30/#afpnetwork which implies:
1 - Mac OS 9.0, 9.1, 9.2 can connect up to 10.5 by default and up to 10.10 with modifications and
2 - Tiger, Leopard & Snow Leopard can connect to Mac OS 9.0 by default.
At this time I am only interested in an AFP connection from Snow Leopard to Mac OS 9.2.2. As previously described I can connect from Snow Leopard but not write to files on Mac OS 9.2.2 which may indicate a permissions issue or something I have not set up correctly.
Any assistance with this would be appreciated.