(This article was first published in the Critical Path, the monthly newsletter of PMI Sydney Chapter publish in March 2022)
ENIAC (Electronic Numerical Integrator And Computer), heralded as the “Giant Brain”, is considered to be the first large-scale computer to run at electronic speed without being slowed by any mechanical parts. In other words, it is the great grandfather of everything on your smartphones and laptops. It was built between 1943 and 1945 in the University of Pennsylvania and was first put to work on 10 December 1945.
Physically, the ENIAC was “the most intricate and complex electronic device in the world” as described by the Popular Science Magazine in its April 1946 issue. The first build contained 18,000 vacuum tubes, 500,000 soldered connections, 70,000 resistors and 10,000 capacitors. It weighed 30 tons, was about 2mX1mX30m in size, and occupied an area of 170 square meters. In 1995, in celebration of ENIAC’s 50th anniversary, the machine was recreated using modern integrated circuit technology. The recreated ENIAC could fit in the palm of your hand. Imagine what its size would be with today’s technology.
The 18,000 vacuum tubes mean there are 18,000 chances to fail. How do you keep so many vacuum tubes working simultaneously? As an effective risk management procedure, the engineers created strict circuit design guidelines to maximise their reliability. They also ran extensive tests on components and avoided pushing them to their limits, which included operating vacuum tubes well below their maximum voltages to prolong their life. The ENIAC worked smoothly until it was hit by a lightning strike in 1955 and put it out of action.
The other interesting fact about ENIAC is actually a tribute to women, in the spirit of the International Women Day. The first program ran by ENIAC was to produce ballistics trajectory tables for the US Army, and the team who was brought in specifically to write this program were all women. This fact was ignored during archiving the information about ENIAC, but Kathy Kleiman, a Computer Scientist and Researcher, decided to track down the women who appeared in some old photos depicting the ENIAC.
When Kathy Kleiman went to the Computer History Museum in Boston to seek information about these women, she was told that the women in the photos were models to make the photos look better. She wasn’t convinced and kept on digging information until she located the six women who programmed and wired the panels of ENIAC for the required calculations. As a result, the six women were inducted into the Women in Technology Hall of Fame in 1997. Kathy also produced a documentary about their story to show it in schools. The story inspired many girls to pursue their dreams in computer science and other STEM fields.
Watch Kathy Kleiman telling ‘The Secret History of The ENIAC Women’ at this TED talk.