Computer Science 1520.docx

34 Pages
Unlock Document

York University
Electrical Engineering and Computer Science
EECS 1520
Lew Lowther

Computerdevice Computing system solves problems and interacts with the environment Composed of hardware and softwareand data that it manages Has many layerseach of which plays a specific role Computer hardware physical elements that make up the machine and its piecesboxes circuit boards chips wires printers keyboards monitorsetcComputer software the collection of programs that provide the instructions that a computer carries outLayers of the Computing System 1There are 6 layers2Each layer is small by itself and performs a specific function when you put all the layers together and allow them to work together amazing things happenInformation innermost layerReflects the way we represent information on the computerHardware the physical hardware of a computing systemSoftware programming The programs that provide instructions for a computer to executeOperating system helps manage the computers resources Examplewindows macApplications using the computer to solve specific real world problems Examplehelping us design a building or play a gameAbstraction a way to think about something that without using very complex detail Leaves only the information that is absolutely necessary to achieve the goal The key to computingMillers Law psychologist the average person can only handle 7 pieces of information in a short term memory at one time 3If you add a piece of information something can get moved and then later stored in the back of someones headThe History of ComputingHardware 16th centuryabacusbasic arithmetic 17th century Pascal sold mechanical machines that can do 18th century Joseph Jacquard created Jacquards loomshowed important use of input 19th century Charles Babbage designed the analytical enginethe design was the first to include memoryAda Agusta extended charles babbages ideas and became the first ever programmer 19th20th century William Burroughs produced a mechanical adding machine Dr Herman Hollerith developed the first electro mechanical tabulatorAlan Turing 19121954Turing Machinean abstract mathematical modelArtificial Intelligence Testing WW2 several computers were under design and construction1First comerical computerUNIVAC IEarly computers launch new era in mathematics physics engineering and economicsHarvard Mark I 1939ENIACElectronic Numerical Integrator and CalculatorEDVACElectronic Discrete Variable Automatic Computerfirst machine with a stored programUNIVAC IUniversal Automatic Computer 1951Commercial computers Build using vacuum tubes to store informationVacuum tubes used too much heat though and were not reliable so the rooms that had these computers in them had to be air conditioned and they frequently required maintenance Primary memory devicemagnetic drumit rotated under a headWhen the memory cell was being rotated too the data was written or recorded from that place1After card readers they developed magnetic tape drives they worked a lot fasterAuxiliary storage devicesexternal storage devicesEx magnetic tape from abovePeripheral devices inputoutput and auxiliary devices Second Generation 1959 19652Development of the transistor Replaced the vacuum tubesNew main component of hardwareSmaller more reliable cheaper faster more durable3Development of the immediateaccess memoryUsed memory from magnetic cores instead of waiting for the memory cell to rotateReplaced the drum 4 Magnetic Disc New auxiliary storage device Magnetic disc is faster than the magnetic tape Disc is organized and each piece of info has its own place on the disc Third Generation1965 19715Integrated circuits Solid pieces of silicon that contained the transistors other components and their connections These circuits were much faster reliable and cheaper than printed circuit boards6Terminal An inputoutput device with a keyboard and screen Keyboard gave user access to comp screen showed immediate responseFourth Generation 1971 present7Computers can be put onto and then moved by using a chip 8The word PC or private computer has entered peoples vocabulary9New names entered the commercial market it was not just IBM anymore but APPLE and Hewlett as well and many more 10Computers in a work setting were called work stations and that meant the computer was not for personal use but for work 11Cables and networks are used 12Computers were set to understand a certain language called the machine language13Some computers are still being made with circuit boardsso there is no end to this generation
More Less

Related notes for EECS 1520

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.