For I/O, EIA RS-232-C dates from 1969 (original RS-232 was from 1960). With a BT RS-232 adapter, and osso-xterm (flying keyboard edition), you could play "I'm-a-terminal" with the N800. Of course, you could use a tape punch/reader for storage in contemporary-machine-readable form. The N800 (perhaps with a custom kernel for the RS-232 adapter?), could definitely hold its own. N810's keyboard could also be nice for the terminal thing.
And you think the camera on the N8x0 is crap; they'll think it's the sweetest video camera interfaced to a computer they've ever seen. (You'll both be right!)
Oh, and don't forget, your N8x0 can blast audio, even multiple frequencies simultaneously. You know what that means... software blue- and red-boxes should be easily constructable. Hey Bell