As for performance, I would like a 100 MHz P5 class machine to cope
   fine with a modem (and a sparc classic to deal with 9600 bps from the
   Truetime, but you're talking abotu com(4)).  I suspect that's not that
   too hard, and I don't have any objections to what you are proposing.



FWIW, a sparc classic could handle 38400 easily running
netbsd a few years ago.