Language
The ROM modules are all the same, regardless of the language of the lettering on the modules. Therefore the language selection is done in the chess computer. Comparing motherboards of different types, I have found that the language selection is done by a diode on the motherboard (D3).
It may also be possible to switch to FRENCH, but I have not checked this.
A 1N4148 diode is suitable.
D3 not installed.
D3 installed.