| I'm presuming here that you are asking for a laptop. Most laptops these days don't come with serial ports. You should be able to get a serial to usb converter from most places like pc world/staples/computer fair and they should do the trick.
I had to have a serial port on mine for work. When I mentioned this, the quotes for new laptops jumped from being in the 400 quid range to the 1400 quid range! |