A Brief History of Computing, starting in 150 BC

CS 441 Lecture, Dr. Lawlor

Folks have been using physical devices to perform computations for a long time. 

Mechancial Devices
Of course, there are serious limitations to mechanical devices: it's hard to even turn a corner with a rotating axle, just like it's hard to make a leak-free joint with liquids.  One huge advantage of electronics is that wires are very easy to route, bend, and join.

Electromechancial Devices
Fully Electronic: Vacuum Tubes and Transistors
Integrated Circuits

Major lessons: