Henry, I bought one of these modems recently: http://www.acortech.com/.sc/ms/dd//9/nc/Modem--Generic/1376/CenDyne%252056K%2520V%252E92%2520External%2520Internet%2520Serial%2520DataFax%2520Modem%2520Bulk It is hardware based, so it works well with Linux. Use the coupon code "pricewatch" for free shipping. Charles