The reason why I am asking is because I think I have damaged my port.
I am using SPP mode.
When windows tries to print, and nothing is connected to the port, I get an "out of paper" message. If I ground the "out of paper" signal, I get a "device fault" in QuickBasic, and in Windows, it says the printer is not connected.
If I set the /ERROR line to 5V, nothing different happens.
What needs to be grounded, and what needs to be connected to VCC (5V)?
I want to make a phony printer to make Windows believe a real working one is connected.