I don't get any error or exception. Button in one Window: private void button1_Click(object sender, EventArgs e) { ControlPort.Output(0x378, 0xff); } and inpout.dll interface: class ControlPo...

I have an Intermec printer connected on an USB port to my computer, the computer doesn't have a parallel port. I want to send some raw commands to the printer, the printer interprets the fil...

I have a very very old PC that is running DOS and using an ISA card to receive the data from an old fashioned testing device. What I want to do is attach the Printer (LPT) wire to the old PC and at...

I am doing direct I/O on a parallel port which is fine and necessary for speed. I would like to enumerate the available ports to offer the user a choice of ports at setup time rather than a tedious...