# data[].attributes.body
beads on rods, used to count and calculate

# data[].attributes.body
Used for math calculations such as logarithms and trigomentry

# data[].attributes.body
First stored program -metal cards

# data[].attributes.body
Difference Engine, Analytical engine-stored numbers on metal punch cards, accurate to 6 decimal places, powered by steam

# data[].attributes.body
!st generations computer used vacuum tubes with no air inside to protect circuitry

# data[].attributes.body
Moth stuck in relay switch.Grace Hopper called it debugging a computer

# data[].attributes.body
Used silicon, Won Nobel prize, on-off switch

# data[].attributes.body
Programmed UNIVAC, Recipient of computer science's first "man of the year award

# data[].attributes.body
First fully electronic digital computer built in the U.S, created at the university of Pennsylvania weighed 30 tons, contained 18,000 vacuum tubes, cost $487,000

# data[].attributes.body
2nd generation computer replaced vacuum tubes with transistors

# data[].attributes.body
3rd generations computers used integrated circuits that were made of transistors, resistors and capacitators integrated into one chip

# data[].attributes.body
4th generation computers had microchips. Intel 4004 Microchip had 2,250 transistors

# data[].attributes.body
256 bytes of memory, 2 MHz intel 8080 chip, cost $395-$495

# data[].attributes.body
Released apple II computer that was used in most schools, First commercial computer with Graphic User Interface GUI and Mouse

# data[].attributes.body
First wide selling computer, 8088 Microchip 29,000 transistors, 256 K RAM, 1 or 2 floppy disk drives

# data[].attributes.body
Computers in most homes, Faster and less expensive, Windows 95 was 1st decent GUI

# data[].attributes.body
Great increase in speed, storage and memory. networking and internet capabilities. CD drives. Cell phones and wireless technology