It's from TDK systems. There's no manual, no software, no packaging.
No-one here has a Palm 5.
I'll be taking it to Ireland with me tomorrow morning. I hope I don't have to bring it back, but if I do I'll be taking it to some other fannish events in the near future -- ZZ9 pubmeet, AC pubmeet, Tun, Novacon.
I like beer.