Back in the day, the printer port was the way to interface experiments on the cheap. I had a spare printer card just in case I blew one up. There were expensi

Back in the day, the printer port was the way to interface experiments on the cheap. I had a spare printer card just in case I blew one up. There were expensive A/D boards and such used in labs, but it was too expensive for hobbyists. On the cheap, best to use a commodore 64.