You'll need a usb<->serial cable and some terminal emulation software (like zterm). Newer Macs really suck for this type of thing. I keep around an old laptop PC since it's perfect for this type of app. It has 4MB RAM and some tiny hd (32MB I think), runs Win 3.11 and hyperterminal (I also have a 1MB "portable" running DOS and qmodem, but it's actually bulkier than the 4MB). The kind of thing you can pick up for $20 at Goodwill. But then again I need terminals a lot because of the stuff that I do.