Has TRUE always had a non-zero value?

Question

I have a co-worker that maintains that TRUE used to be defined as 0 and all other values were FALSE. I could swear that every language I\'ve worked with, if you could even

Answer 1

I remember PL/1 had no boolean class. You could create a bit and assign it the result of a boolean expression. Then, to use it, you had to remember that 1 was false and 0 was true.