I worked in the 70's as a professional programmer using punched "Hollerith" cards. Some of this article is a bit off. You don't just start programming one day.

I worked in the 70's as a professional programmer using punched "Hollerith" cards. Some of this article is a bit off. You don't just start programming one day. In those days you would take a two-week course at the vendor or at a University. You don't discover that you have to compile your program after you have written it. You are taught that in advance. The keypunch operator knew this was source code, and would never give you an uninterpreted deck. That was only for data. I maintained a 4,000+ card program. I used two special metal trays, with a tab that pressed and locked in the cards securely. There was no "2,000-card" limitation. The operators were trained to feed thousands of cards in the card reader. Our master file was 40,000 cards, read through twice a day. We used a binary image technique, allowing us to store 240 4-bit digits (3 x 80) per card.