Like they expect me to figure out on my own. high logic? They don't tell any of this in the manual.

Or perhaps there are different wirings for different version and revisions of the port?Īnd what's with the little minus signs? Is that indicating something? Perhaps low vs. But why is BUSY on pin 21 here and on pin 11 there? It seems like they messed it up, got it wrong or something, perhaps to make you buy their own damn I/O plates. Like, STB stands for Strobe, and it's on the first pin, so that's good. Pin Signalĭon't they have to match up? I must guess what those dumb abbreviations used by motherboard manufacturer actually mean. Here's the parallel port pinout according to Wikipedia. Is this according to standard? What standard would that be?. This is the pinout used by the motherboard (captured from the manual). Then there's also the confusion with pin labeling. The headers on the motherboard are not boxed, so there's no way telling the orientation in which to connect the cables. I bought one of these combined LPT and COM port I/O plates. PCI cards take up space and I have to worry about drivers, which platform I'm using (Linux vs. So instead of buying one of those PCI cards with LPT and COM ports, I decided to use the built-in logic of the motherboard. You can see these pictured in the image below. However, there are LPT and COM port headers on the board. The board has no LPT or COM port on the I/O panel on the back.

I would like to add an LPT and a COM port to my computer.

Pc serial port pinout db9