Laptop for connecting to CNC?

[Neale]

If you are going to run Windows 10 then you can't use the parallel port on any PC with Mach3, so you must use some kind of external motion control hardware. Something like UC100 is the most basic of the usual choices. If you use an external motion controller like that, then any PC capable of running Win10 will run Mach3. However, if you are buying something then it probably makes more sense to use UCCNC software (same manufacturer as UC100) which is more modern and still being supported. Unlike Mach3 which froze development years ago.

The motion control hardware offloads a lot of the computation needed to drive a machine which means that the PC used becomes much less important.