Laptops :: lowest-end machine to run kismet?

What's the slowest machine anyone's run DSL and kismet with? I'm looking to put something in our boat that'll scan for wifi. I've got an ancient Toshiba T2155CDS/520 (486DX/75 & 28mb of RAM) that seems to be running DSL quite happily. But before I go waste a few more days, will it even be able to keep up with running kismet?

And whose USB PCMCIA card is known to work with DSL in such a low-end machine?

original here.