If you use a Super Serial Card, the easiest connection is to move the block on the card to the "Terminal" position and use a straight-through serial cable. I routinely use 19.2 but remember pulling it back to 9600 sometimes. For boot strapping, you may even want to try setting it lower - 1200 or so.

EDIT: the ADTPro page actually suggests setting the card to 300 baud for bootstrapping:

http://adtpro.sourceforge.net/connectionsserial.html