I have recently learned a little bit of Visual Basic. I came up with an idea just a few minutes ago about a circuit that i could build that plugs into the parallel port that would control the speed of ...

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 needs ...

A parallel port, which is standard equipment on nearly every IBM-compatible PC, can be connected directly to TTL/CMOS circuits. The standard parallel port provides 12 logic outputs and five inputs.