@tlayoyo

Back in the stone age (1978-ish), I had to submit my code to a punch-card operator. I had to explicitly state at the top of every sheet that 'slashed' meant 'zero' and 'unslashed' meant 'alpha' 🙂

@bytebro @tlayoyo

Writing code in the beginning of the 70s slashed O was zero, then Z and 7 had a horizontal line through them. The punch card team knew exactly what these meant.