Just hooked up the 4 serial port/USB device and it works pretty darn slick. For $125 it takes all the pain out of running programs that are comm port hungry. It is made by VSCOM a Taiwanese company and I see they also make an 8 port model but Byte Runner does not have it on their web page. Now you can run all the comports on your computer, PLUS 4 more. Bob, W3PT