Port menu:

I/O Port: allows you to select com1/2/3/4 or special. If you
select "special" you will be given the chance to set
your modem's Base Port.

Interrupt: this is usually selected automatically based on the
I/O port you selected above. For com1 and com3 use
interrupt 4. For com2 and com4 use interrupt 3.

Baudrate: if you are using a 16550 uart and a 28.8 modem
select 115200. Some people have reported problems
running at this speed. Try 57600 if you get
lockups. If you have a 16550 uart and a 14.4 modem
select 57600. If you don't have a 16550 uart you
must select a speed of 38400 or slower.

Flow Control: select Hardware.

Open Type: select Active for most configurations.