Although the software I ran on the PC to control the Video Switcher is beyond the scope of this article, I needed to update it to use USB instead of the parallel port. A recent failure of the PC I used to operate the Video Switcher meant I needed to find an alternative to the parallel port. Unfortunately, fewer PCs are fitted with parallel pors these days and, for a laptop, it's not really an option. Arduino and Delphi Controlling Outputs with the PC Controlling Arduino Outputs with the PC Elsewhere on my website, I show details of a which can be controlled using the computer's parallel port.