I have just discovered the root of all evil.

Doesn't that tab control look suspiciously similar...
Our nice controller is based off this reference design:
http://nuvoton.mcuzone.com/N32905.htmlThis can actually be bought from AliExpress. However, I am currently not able to spend ~80€ on one of these (30€ shipping to Germany).
They include the holy grail, the DVD with source code to a lot of things we don't have yet.

Unfortunately not to the CNC functions, but to all OS functions, but I am starting to grasp how the CNC functions work.
Having this kit would also enable us to modify the boot screen. We could also use a more modern user interface such as Qt Embedded and we could finally upgrade the system.
https://www.aliexpress.com/item/N32905-NUVOTON-ARM926-core-based-Soc-with-on-chip-32MB-DDR-MDK905-EK-T43-USB-LCDC/1808063633.htmlSeems like the Chinese like to copy from each other. The above package is probably what they used initially for developing our beloved CNC controller.
The above MCUZone site shows well what the technical specifications of the processor are.
I'll keep you all updated.