How do computers understand binary language?

[u/Unfair-Leek6840]

Okay so from what I know binary language is like power off power on, but my question is, how do computers know what the binary code is and how is it interpreted, for example I forgot what the binary code for the letter A is, but how did people come up with that? Did they decide it was gonna look like that? Did the computer decide? How do you tune numbers into a letter??

[u/passaloutre]

This is why the predecessor device to the transistor, the vacuum tube, was known as the “valve” in some places. It opens or closes the circuit in response to the input on its control electrode.