fundamental operations in Boolean algebra

• SUM

• NOT

• AND

• OR

switches in early computers

• vacuum tubes

• diodes

• mechanical relays

• transistors

electronic switch built in 1947

• transistor

• semiconductor

• diode

• vacuum tube

bug that was pulled from the Harvard Mark II machine

father of computing

• Alan Turing

• Charles Babbage

• George Boole

• Herman Hollerith

system of notation that represents information using two states

earliest recognized device for computing

• astrolabe

• punch cards

• step reckoner

• abacus

first general purpose computer

• Analytical Engine

• Colossus Mark I

• Harvard Mark I

• Tabulating Machine

first computer programmer

• Ada Lovelace

• Grace Hopper

• Charles Babbage

• George Boole

electronic component that permits the current to flow one way only

• mechanical relay

• vacuum tube

• diode

• semiconductor