What do series and parallel circuits ... today's lesson in circuit analysis will help you appreciate holiday lights on a whole new level. [Theme Music] Let's keep things simple.

Because, unlike a simple string of lights in a series circuit, these are all arranged in a parallel circuit. And you can think of a parallel circuit as having several different routes that all run ...

So I'm trying to detect through Visual Basic 6.0 when a voltage change occurs on one of the pins of the serial/parallel port. The whole thing is pretty simple; no data transfer/handshaking/etc ...