[newbie] MODEM Com port?

[Charley & Peggy Robinson]

  I'm using a 3-Com (USR)  MD-U56P2977 PCI hardware (they told me)
MODEM.  The BIOS in the 'pooter assigned it to Com 5, according to win
dev mgr.  Trouble is,  X or Gnome deal only with Coms 1 - 4, so I can't
reconfigure the SW in a GUI.  Sadly, I don't know enuff yet to do it in
console mode.  I've been searching MUO, MNO, etc, but haven't found any
specific info yet.  

  Can anyone tell me where the info is stored and how to access/change
the com port?

  TIA,

  Charley