Here's a bit more info with respect to displays for the BBB. (Or Pi for that 
matter)
The Backpack with Touch HDMI from Adafruit is 800x480  (out of stock and is now 
800x600) 
https://www.adafruit.com/product/2407
On my Version the Beagle MachineKit main screen looks nice.
http://www.autoartisans.com/beagle/800x480_Display.jpg
But run MachineKit and it's clear that the screen really is too small for the 
AXIS user interface.  
http://www.autoartisans.com/beagle/800x480_MachineKit.jpg
So to use this with MachineKit requires a new user interface design and that 
means something like the PSNG screen for probing is also not usable without a 
complete redesign.

I did show the phot with the two MANGA screens.  They came from Norway, made in 
China.  
https://www.iagent.no/product/manga-screen-2-big/
The MANGA2 is a 1080P screen in size and if I could figure out how to boot to 
turn the display 90 degrees everything would should up but boy are things 
tiny...
http://www.autoartisans.com/beagle/Manga2_MachineKit.jpg

I forget the resolution of the MANGA 1 screen but again needs to be rotated and 
might also be too small.
http://www.autoartisans.com/beagle/Manga1_MachineKit.jpg

There is a version of the PSNG Probe screen for 1024x768 so I think that would 
have to be the minimum LCD display in at least 7" but likely better 10" for fat 
fingers
http://www.autoartisans.com/beagle/Screenshot1024x768.png

I'm pretty sure this was the latest HAL and INI files for this BBB.
http://www.autoartisans.com/beagle/XylotexG3616.hal
http://www.autoartisans.com/beagle/XylotexG3616.ini

A 1280x800 10" display is available from Amazon.ca for $235 but no touch screen.
https://www.amazon.ca/Eyoyo-Monitor-1280x800-Resolution-Security/dp/B072N2YGXN
Or 1280x800 with touch screen for $169.
https://www.amazon.ca/Raspberry-Inch-Touch-Screen-Touchscreen/dp/B0776VNW9C/ref=sr_1_10
No idea how good this is but if it did work with the Beagle or the 
PI4+MESA_7i92 it could be a nice small form factor CNC system.
Upside with RPI up to date LinuxCNC.  
Downside with Beagle is old MachineKit but hardware is already here for a small 
lathe.

All of this is relative turnkey and doesn't involve writing a brand new CNC 
program on an ESP32.
John



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