In Tokyo in 1964 I bought a Soroban with Kojima’s book "The Japanese Abacus: Its Use and Theory". That sparked my interest in abaci, and in computers.
After getting my M.Eng.(Elect.) at Cornell, my 30 year career included working on the design and construction of nuclear power plants, missile systems computer programming, and industrial and engineering computer systems sales and systems engineering.
Deciding to become a high school math teacher at the end of 2000, I took a History of Math course as part of my M.Ed. Program at UMassLowell. I was struck by how easy it would be to use ancient Roman, Greek, Egyptian, and Babylonian numerals to record abaci calculation results. Prof. Gonzalez said, "Yes, but how would you do multiplication and division?"
So as a hobby, I've worked the last 9 years to (re)discover the schematics and programming rules of the computers the Ancients used to design their weapons, do their accounting, and support and empower the greatest empires in human history.
I hope you find Ancient Computers interesting and useful,
Steve Stephenson, M.Eng.(Elect.), M.Ed., sks23 at cornell dot edu
Math Teacher (precalculus and calculus), Lowell High School, MA, USA