I'm not familiar with Citrix at all, but in Windows2000 (maybe NT4 too?) you can capture LPT1: to the USB printer. I use this for stupid apps that are hardcoded to write to LPT1:<BR><BR>H@ ...

Don't use COM ports, just get an extra LPT port for the system that the printers are connected to. Connect them both up at the same time, create a share for each (say \\printserver\dotmatrix and ...

Posted in computer hacks Tagged beginner concepts, darlington, LPT, printer port ← Turing Machine A Masterpiece Of Craftsmanship Swapping Coins Cells For Capacitors For Noise Filtering → ...

Few of the latest PCI Express PCs come with the long established LPT printer port. These can now be added using Brainboxes products, the cards provide fully bi-directional Standard Printer Ports (SPP) ...

Usually when you first install any operating system it will install the printer port as lpt1. What I suspect is that both com1 and lpt3 are using the same IRQ or the same hardware address.

The circuit uses a MAX542 16-bit serial digital-to-analog converter (DAC) with three-wire connectivity to the PC's LPT port. The DAC receives the slewing-voltage input from IC1 pin 6 as a V REF.