> For example, Digital minicomputers were much slower compared to PC 
> motherboards, yet they were able to handle industrial applications just 
> fine. Application ran in RT OS to handle DIO or analog signals.
> 
> Old PDP HW is getting replaced with special PC cards that are able to 
> run original software while generic Windows runs on the PC. No latency 
> issues. Same should be possible with LinuxCNC IMO.
> 
> > In practice few stepper systems have hardware that can follow even a
> > 50uS base-thread. I spend a lot of time on the forum saying "Stop
> > fiddling, it's fine as it is, get on with something productive"
> >
> 
> Agree. 3D printing world is growing precisely because of dedicated SBCs 
> built with low cost microcontrollers and motor drivers. They handle 
> everything including UI for selecting files from tiny memory cards.

If real time tasks is placed on micro controller which communicate with GUI on 
ordinary compute there will be: Communication, real time tasks and nothing 
else. It is simple and may be run with or even without operating system.

PC is mainly needed to connect user interface, like a screen.


> Large CNC systems require more computing power of course, but that too 
> should not be a problem for decent IO cards independent of motherboard 
> latency.

Well actually I expect more computing power will be needed in small machine 
where fast dynamic responce is required. I also expect more computing power is 
needed for complex kinematics like hexapod.

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