[Fernando] wrote in to share his take on building a logic analyzer. He’s using the parallel port to capture data and feed it to the display software of your choice. The method depends on a ...

In the past, the parallel port was widely used for printers and occasionally for connecting other devices externally, but was superseded by USB. Although some business printers may still offer ...

Before USB (short for Universal Serial Bus ... Serial ports gave way to the more robust parallel ports, which were most commonly used for printers and scanners but also external storage devices.

Then he realized, why not make a simple printer port add-on that looks like a printer, but sends the data over USB as a serial stream? On the hardware side, the custom PCB (KiCAD project ...