Can't speak for an Ipaq, but my PalmTX (11b as well) connects
fine to my 655, though only when operating in b&g only
mode (probably in b or g only as well, but don't want that).
If I go to b/g/n mixed mode, it will not connect, in fact it
won't even see the network (even in WPA only mode).
I'm running w/WPA-TKIP on the Palm, WPA-PSK enabled on
the router, auto WPA or WPA2, and running in 'invisible'
mode.
FW version is 1.05, HW is A2.
Now if only I could get my linux laptop to speak 11n _and_ get
the router to and the Palm to talk when it's configured in b/g/n
mode I'd be truly happy.....
At least I'm back to where I was on the DI-624 before it died on me.