1834: Punch Cards - Computer Memory
There is a time in your life when you start feeling old. That feeling has a tendency to surface more often as time goes on. Punch cards are just one more example for me: The first science books we used in school in the early 1980s still illustrated punch cards as the medium of choice to store data "digitally". Of course, punch cards are much older than that. Charles Babbage, an English mathematician and the person who is credited with the idea of the programmable computer. He built the "Analytical Engine" from 1834 until his death in 1871. The device used punch cards as read-only memory. The total memory integrated in the Analytical Engine was the equivalent of 675 bytes.