Crash Course: Computer Science 1-3

earliest recognized device for computing

three operations in Boolean algebra are NOT, AND, OR

first "general purpose computer"

built an electro-mechanical machine called the Bombe

NOT is commonly represented by a "Letter D" symbol

mechanical switches used in early computers

In the early days, a "computer" was a person who did calculations

electronic switch built by Bell Laboratory in 1947

The "electro-mechanical" tabulating machine was used during the census of 1890

type of "bug" that was pulled from the Harvard Mark II

gear-based calculating device

AND is commonly represented by a "triangle with a dot"

The first large-scale use of vacuum tubes for computing was the Colossus Mark I

one of the largest electro-mechanical computers

world's first programmer

formalized the "Mathematical Analysis of Logic"

considered the "father of computing"

material that can sometimes conduct electricity and other times resist it

electronic component that permits the flow of current in one way only

time it took for the Harvard Mark I to calculate complex operations

A faulty relay on the Harvard Mark I needed to be replaced every week.

system of notation that represents information using two states

OR is commonly represented by a "spaceship" symbol

Who said "When anything went wrong with a computer, we said it had bugs in it."?

device that enabled sailors to calculate their latitude at sea