If I have GRUB2 installed on a system that is using a foreign keyboard and I want to use CLI Mode, what key would I press? On Latin-based keyboards, we would press "C", but other alphabets lack the symbol "C". Is there a special GRUB documentation page for foreign keyboards? Are older forms of GRUB the same (GRUB Legacy)?
The grub manual describes the limitations caused by platforms and that GRUB only uses AT keyboards. I am not aware of any keyboards for foreign languages that do not also support basic ASCII.
Even the simple foreign keyboards used in the USA have all of these characters (maybe because A in ASCII stands for USA and not all of of the North and South America continents), although those keyboards have some keys at different location than I was used to.
Although that all is not a proof, I feel safe to say that any keyboard AT style keyboard for all definitions of "foreign" will allow you to use
I figured it out. Foreign keyboards have Latin letters on them. So, I can still press "C" which on a Greek keyboard would also be "Ψ".
Image from http://aramedia.com/kb-fireflygreek.jpg