A KVM switch is no use as I have one monitor/keyboard/mouse next to one machine and another set next to the other. There are enough USB ports to connect 2 mice and keyboards just need to get a VGA splitter for the monitors.

I will be using the Parallel and Serial port for the Mach3 machine (these ports are on a PCI card) and a USB port for the Denford machine.

I got the Mach 3 sde of it up and running today and it is only using 2% of CPU and 40% of the memory. Tomorrow I will look at the Denford side of things.