Once upon a time, flowcharts and coding sheets were the prime tools of a programmer. They formed (and still probably are) one of the primary usages of visualization. I recently stumbled on an old IBM manual from 1969 (yes that is 40 years ago) which describes in detail how to create such flowcharts. The accompanying plastic X20-8020 flowcharts templates really do provoke some childhood memories, when I liked their springiness, but often wondered what they were good for.
What is your personal early childhood visualization memory?
For more computing nostalgia, visit the Historic Documents in Computer Science webpage, which includes PDF versions of old manuals spanning computer languages (e.g. Fortran, Algol60, Pascal, ...), the Ethernet patent, John von Neumann's First Draft of a Report on the EDVAC, and much more.