The first computer I ever programmed was an IBM 1440 (A slightly modernized, cost-reduced version of the wildly popular IBM 1401). A good capsule summary of these two can be found at Ed Thelen's site based on the BRL, a "census" of computers published yearly in the 1950's and 1960s. That link apparently hits an anchor right about where the 1401 description ends, and the 1440 one begins.
If I write much about my 1401 experience back in the day it will be in mystory. RetCom is for recent experience with Retro computing.
At the moment, this (RetCom/1401) contains an example of a single card "HELLO WORLD" program, with explanation, and an account of a demo I did, sending Morse Code from the 1401.