Adding serial 'tty' ports

[Mike O'Donnell]

We have just purchased a CompuAdd 386 PC with four serial ports and
installed uport SYS V/386.  However the systems seems to recognize only
two of the ports (or so it seems) - tty00 and tty01.  I need to 
get it to see the other two ports.  One of the ports will be used for
a modem, one for a printer and one for a terminal connection.  I am
very new and ignorant when it comes to configuring anything in unix so
any help will be greatly appreciated.