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 ...

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 ...

You can control the programmable oscillator circuit in Figure 1 via an IBM-compatible PC's parallel port, which also provides power to the circuit. Resistors R 1 and R 2 limit power-supply current ...

Designers may program the CPLD with any industrial parallel CPLD programmer, but the best method is to use the in-system reprogramming (ISR) feature. J1 is a JTAG port designed for this purpose.

So he found out in the best possible way: by doing it. The Covox Speech Thing is a very simple device, a discrete component digital-to-analog converter (DAC) that uses computer parallel port.

This circuit uses the parallel port on the PC to interface to a MAX147 12bit, 8 channel A/D converter. By using the National LM4040AIM-4.1 reference, an accuracy of 0.1% is obtained.

Such an offering is [Serdef]’s Tiny Parallel Port General MIDI Synthesizer for DOS PCs, a very professionally produced synth that you might have paid a lot of money to own three decades ago.