Hi. Be very careful about this since almost all newer modems, especially 56 K are Winmodems and will not work well (if at all) with Linux. However, I have seen a new setting in the 2.4.12 kernel about this, but since this computer does not have a modem at all I did not look into it. However, there is one known brand which works with DOS, so I am sure it would work with Linux. I think it is US Robotics, now made by 3Com. Can someone confirm this? I have one which I could consider selling but it is a little expensive. That is why Winmodems are so popular, because they are cheap and use your computer's resources.