The document discusses the history of early electronic data processing and computer generations. It describes the Mark 1, the first fully automatic digital computer completed in 1944. It then discusses the ENIAC, the first general-purpose electronic computer developed between 1943-1946 using 18,000 vacuum tubes. Finally, it introduces the EDVAC, the first computer designed to be stored-programmed, employing binary arithmetic and developed by John von Neumann. It categorizes the evolution of computers into four generations based on the underlying technology.

1. Data ProcessingLesson 4

2. 4-1 Early Developments in Electronic Data Processing4- 2 Mark 14 - 3 The Eniac4 - 4 The Edvac4 – 5 Computer Generations4 – 6 First Generation Computers4 – 7 Second Generation Computers4 – 8 Third Generation Computers4 – 9 Fourth Generation Computer

3. Mark IHoward Aiken began work on the Mark I at Harvard UniversityMark I digital computer was completed in 1944Mark I official name was Automatic Sequence Controlled Calculator.Mark I functions:Could perform arithmetic operationsCould locate information stored in tabular form.

4. Mark IProcessed numbers up to 23 digits longs and could multiply three eight-digit numbers in 1 second.It was not an electronic computer but as rather an electromechanical one

5. THE ENIACENIAC – Electronic Numerical Integrator and CalculatorENIAC was developed by Presper Eckert Jr. aand John Mauchly from 1943 to 1946.It has 18,000 vacuum tubes and required the manual setting of switches.It could perform 300 multiplications per second

6. The EDVACEDVAC is the modified version of ENIACEDVAC – Electronic Discrete variable automatic ComputerEDVAC employs binary arithmeticJohn von Neumann invented the EDVAC

7. Computer GenerationsFirst Generation ComputersSecond Generation ComputersThird Generation ComputersFourth Generation Computers

8. First Generation Computers ( 1951-1959)The use vacuum tubes in place of relays as a means of storing data in memory and the use of stored-program concept.It requires 3.5 KW of electricity per day to keep the vacuum tubes running

9. Second Generation Computers ( 1959-1964)Solid-state components ( transistors and diodes) and magnetic core storage formed the basis for the second generation of computers

10. Third Generation Computers ( 1965-1970)Integrated solid-state circuitry, improved secondary storage devices and new input/output devices were the most important advances in this generation.

11. Fourth Generation Computers ( 1970 to present)The major innovations were in the development of microelectronics and in the development of different areas in computer technology such as: multiprocessing, multiprogramming, miniaturization, time sharing , operating speed and virtual storage.

12. The Edvac