Mach3 runs on my laptop reasonably well but is not perfect. The driver test is all over the place on it. I ran the driver test on my new dell dimension 5150c desktop and it is almost a perfect flat line and 25k pulses per second. I would like to use the desktop but it does not have a printer port. Is there any way around this? cheers     

Get a PCI printer port and you should have no trouble should be from $10 - $20 USD