The HP-65 was not only HP’s first programmable scientific, but it could also read and write magnetic cards. There were several 'pac’s of cards allowing it to tackle financial, astronomical, aviation, electrical and other speciality field calculations. The buttons were double shot and have a lovely tactile click. The red LED screen is remarkably crisp and easy to read.
No, there was a small slot that you would feed the magnetic card into from left to right. It had a little motor that would pull it through. I still have mine somewhere.
I’ll have to see if there’s a deep dive on that somewhere. It sounds fascinating!