The Imagewriter I printer cable has been a long-time favorite
rs422-rs232 null
modem cable. If you happen to have one of those, then you're in good
luck.
Just connect the two. If you want a new connector, just go to Radio
Shack, and
pick up a db25-sub connector with clip connections, and you'll be able
to wire
it right up with a pair of pliers, wire stripper, and a screwdriver.
Just make
the connections identical.

-John