I have an ancient system running Mach 3 on a Windows 7 pc through parallel ports to a motion control card driving servos.  I want to change the hardware to a USB interface motion controller card.  I'll get a new laptop and run Mach 3.  What are the recommendations for a motion controller card and BOB?

Perhaps the easiest (and cheapest) solution would be to use a CncDrive UC100.

Tweakie.

The UC400ETH is just a little more, and it is Ethernet. So much more reliable:
- Not sharing the grounds between the PC and CNC.
- Client-Server connection instead of running as a device on Windows.
- No significant cost difference.

Or even better, go with the Ethernet Smooth Stepper, which is fully compatible with Mach4 so that you can upgrade when you need to.

Arturo Duncan
https://cnc4pc.com