Hello, I am new here, but I have used this site for 9 years for info. Anyways, Here is the issue. Right now, I have a CNC Mill, with a P1 MB, and the controller card for the machine is ISA, plus it runs on DOS. I have DOS 7.1 installed right now, and it works fine. When I installed the P4 board, the led lights come on, on the control card, and the computer is sending the code to it, but will not connect with the card. I am trying to figure out if it is an IRQ conflict, or what maybe causing this. One other thing, it has a PCI VGA card. I pulled the AGP card from another computer, to try that, but not sure if it will work. Does anyone know anything about ISA slots with a P4 MB?