7i92H

Actually the RPi5 seems to handle longer cables better than the RPi4. Only noticed when bench testing my Frankenstien boards.

Ethernet is definitely the go.

I'm loving hearing this, as I've never used RPI I was interested for two reasons, one because it's very compact and the other because it uses its compact and cheap touch screens, but I'm afraid I'll have difficulty as I've never touched one and I need a lot of help from you... In parallel to this subject in relation to 7i92H, how do you do in relation to the spindle since it doesn't have a 0-10v analog output?

Mesa have a product called spinx or similar, converts digital pwm to isolated analogue out.

The new image I'm working is created using the same utility that Raspberry Pi company uses to create their own images, so basically raspios with a real time kernel and Linuxcnc pre installed. Far more raspios than the previous.

This Chinese BOB has 0-10v analog output. The price varies greatly $5 - $15.

"Greatly" might be an overstatement for $±5.

Don't forget old PMDX boards (PMDX.com).

My machine has one, it's good, though they are so absurdly overpriced no sane person would ever buy a new one, but buying an old PMDX breakout board for cheap is certainly not a bad idea.