Not sure if this is applicable in your situation, but I'm running Netatalk under Slackware 13 (upgraded from Slackware 12.1). After my upgrade, I noticed that I couldn't connect to my Slackware PC anymore from the Q650 running Mac OS 8.1. Apparently, the version of Netatalk under Slack 13 (2.0.4 from what I can tell) disables the cleartext authentication by default. I had to add the uams_clrtxt.so module in afpd.conf and everything started working as it did before with the Q650.