I don't have a poem, but I do have an interesting (I hope) story. I learned to program back in the 1960s on IBM equipment using punch cards. One evening four years ago I was waiting for my food in a Mexican fast food joint in Las Vegas and having a casual conversation with a couple of other customers about my age when the discussion somehow turned to old computers and using cards. It turned out that this lady and her husband had been programmers in the military back during the Vietnam war. While her husband was stationed someplace in South Vietnam, she was back in the US. During the period he remained overseas they exchanged love letters on punch cards. Their correspondence may or may not have rhymed, but I'm sure it was poetry to them. :-D