Some follow-up: I received the following from Fellowes Tech Support. Are there separate drivers for each model of PDA? Isn't it the same PRC file for Palm OS based units? Confused. Anyone using a keyboard on a TH55? -Thanks.

Thank you for your interest in Fellowes products. The Stowaway XT keyboard
(#90188) is Compatible with the following Sony Cli? models: NR70, NR70V,
NX60, NX70, SL10, SJ22, SJ33, SJ35, T400, T415, T425, T600, T610, T625, TJ35
and TG50 models. At this time we have no drivers that allow the keyboard to
function on the TH55. We apologize for any inconvenience.

Fellowes Technical Support