Nope. Screen is a great terminal program. Read the man page. I use screen all the time on my mac with a USB to serial adapter.

Now that is not the most common usage of screen, but it works. I've been intending to try the n800 with screen to see if I can get a bluetooth terminal session into my GPS.

I have a USB serial adapter on my mac and I use it to talk to an embeded linux box at 57,600 baud, 8 data bits, 1 stop bit, no parity, no handshaking with the command:
screen /dev/cu.usbserial-FTCYPKJ5 57600,cs8,-ixon,-ixo
n,-istrip

David