Grant, B&B Electronics makes both types... USB to serial (I use a two-port and a 4-port at work) that are industrial grade and also card based units with up to 6-ports. They're not cheap but they work. Their staff is very helpful on the phone. Bill WB6JJJ On Sep 4, 2013, at 8:21 PM, "W5XB" <w5xb at att.net> wrote: > Hello Writelog Gurus, >> As more devices need serial ports, I am out at 4 available. >> I see Startech makes two port PCI cards. >> Are there other recommendations? I think I remember someone posting a year > ago about a 4 port card. >> Thanks and 73, >> Grant > W5XB >>>> _______________________________________________ > WriteLog mailing list > WriteLog at contesting.com > http://lists.contesting.com/mailman/listinfo/writelog > WriteLog on the web: http://www.writelog.com/