Alright this is probably a really dumb question but I havent found it covered by another thread, probably because it's so basic:

Is it possible to access a computer who doesnt want to boot anymore (boot prompt) from a Linux machine with a serial connection? This is not an emergency, I am just interested because I have read about data recovery with Linux but most people seem to do this with ethernet and I dont have a clue how all this networking and connecting stuff works.

And if its possible is there a tool in knoppix to do this? Or do I just have to mount the serial?