generations of computers
- Created by: maxullman
- Created on: 26-01-15 13:23
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- computers
- 1st generation
- examples
- colossus 2nd world war
- thermostatic valves
- input =holes in paper tape
- output = printer
- british
- ENIAC
- general purpose
- USA
- 27 tonnes 64 sq meters
- plugs and wires
- slow and unreliable to use
- military uses
- colossus 2nd world war
- must be programable
- program is set of instructions
- has input and output
- this is the DATA
- electronics
- switches on /off
- binary 0 or 1
- switches on /off
- examples
- 2nd generation
- transistors
- silicon crystal used as switch by blocking or allowing electrical conduction
- much smaller than valves
- less power consumption
- quicker
- cheaper and more reliable
- large mainframes
- 64000 dollars
- mini computers
- size of wardrobe
- screens and keyboards
- 16000 dollars
- small businesses
- early 60's
- size of wardrobe
- transistors
- 3rd generation
- integrated circuit (silicon chip)
- seeral components integrated on same crystal
- quicker and cheaper and smaller
- keyboards and monitors
- multiple terminals to one computer
- forms on screen for data entry
- floppy disc
- programs and data portable
- integrated circuit (silicon chip)
- 4th generation
- the start of PC's personal computing is born
- 1970's
- micro processors
- single integrated circuit
- central processing unit
- manages storage, retrival of data and processes instructions
- central processing unit
- single integrated circuit
- can manufacture large numbers
- refining of systems
- 1st generation
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