While looking for something else entirely, I found my old handspring visor neo (not my first, I had an older black one before it) and external keyboard.
So I put a couple of new AAA batteries in it, restored the environment from the sdram backup module, and there it was, old emails, notes, and all. Keyboard still worked as well.
Singularly useless nowadays when the phone does it all but nice to see old technology still working.
Well a bit of digging suggests that the only real integration software option would be jpilot and installing it on my xubuntu netbook. Even then I wouldn't get offline email creation, something I used to think was a killer application, and given the lack of wifi on our local V/line service.
The other weird thing is that there is a market for second hand and refurbished visors and pilots, either among people who won't use a smartphone, or indeed who value the long battery life for a number of reasons, including those who live off grid ...