[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past, the parallel port was widely used for printers and occasionally for connecting other devices externally, but was superseded by USB.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 ...

The circuit uses a HC245 octal bus transceiver to feed the 8 data lines on the parallel port. (You can use a variety of chips for this application, most CMOS buffers will probably be fine.) ...

The first hardware keys plugged into the serial or parallel ports. Because there was only one serial and one parallel port on the computer, the key acted as a pass-through so that other keys and ...