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Note on Electro Mechanical Computers

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MARK-I

It is the first electro-mechanical computer developed by Howard Aiken in 1937. The machine was 5ft long, 3ft wide and 8ft high and used in 18000 vacuum tubes. The machine took 1 second to perform 3 mathematical calculations.


http://i.imgur.com/xsEy4N0.jpg
Atanasoff Berry Computer (ABC )

In 1942, J.V. Atanasoft and Clifford Berry in 1942 developed Atanasoff Berry computer. It was developed to solve simultaneous equation.


ENIAC (Electronic Numerical Integrator and Calculator)

In 1946, this machine was developed by John Mauchlay and J. Presper Eckert. It used decimal number system for calculation. This machine can calculate 300 times faster than any other machine of that time. This machine was used in military operation for firing ballistic missiles.


EDSAC (Electronic Delay Storage Automatic Computer)

This machine was developed by Maurice Wilkes and his team in 1949. 3000 vacuum tubes and consumed 30KW electric power.


EDVAC (Electronic Discrete Variable Automatic Computer)

This machine was developed by John Mauchlay, John Presper Eckert with assistance of John Von Neumann in 1952. This machine was the first machine that could store programs in it with the help of binary digits.


UNIVAC ( Universal Automatic Computer)

This machine was first developed by John Mauchlay and J. Presper Eckert in 1951. This was the first computer developed for commercial use.


Some useful technical terms
  1. The first computer brought in Nepal. (IBM 1401)
  1. The first mechanical device using strings on beads. (Abacus)
  1. Father of computer science. (Charles Babbage)
  1. The first automatic electromechanical computer. (Mark-1)
  1. The first commercially used general purposed computer. (UNIVAC)
  1. The founder of IBM Company USA. (Dr. Herman Hollerith)
  2. The person who gave stored program concept. (John Von Neuman)
  3. The main component used in third generation computers. (Integrated Circuit)
  4. The computer generation in which laptops and palmtops are being developed. (Fourth generation)
  5. The branch of computer science that will possess reasoning power as human being. (AI)

Full forms
  1. Bit : Binary Digit
  2. GIGO : Garbage in Garbage Out
  3. CPU : Central Processing Unit
  4. IPM : Information Processing Machine
  5. MIPS : Millions of Instructions Per Second
  6. ECG : Eco Cardio Graphy
  7. ATM : Automatic Teller Machine
  8. ICU : Intensive Care Unit
  9. CD-ROM : Compact Disk Read Only Memory
  10. DVD : Digital Versatile Disk
  11. EDSAC : Electronic Delay Storage Automatic Computer
  12. EDVAC : Electronic Discrete Variable Automatic Computer
  13. UNIVAC : Universal Automatic Computer
  14. ENIAC : Electronic Numerical Integrator And Calculator
  15. ASCII : American Standard Code for Information Interchange
  16. E BCDIC : Extended Binary Coded Decimal Interchange Code
  17. BCD : Binary Coded Decimal
  18. IC : Integrated Circuit
  19. LSI : Large Scale Integration
  20. VLSI : Very Large Scale Integration
  21. ULSI : Ultra Large Scale Integration
  22. PC : Personal Computer
  23. IBM : International Business Machines
  24. ASCC : Automatic Sequence Controlled Calculator
  25. ABC : Atanasoff Berry Computer
  26. PDA : Personal Digital Assistance
  27. GaAs : Gallium Arsenide

  • Mark-I is the first electro-mechanical computer developed by Howard Aiken in 1937.
  • In 1942, J.V. Atanasoft and Clifford Berry in 1942 developed Atanasoff Berry computer.
  • EDVAC was developed by John Mauchlay, John Presper Eckert with assistance of John Von Neumann in 1952.
  • UNIVAC was first developed by John Mauchlay and J. Presper Eckert in 1951. 
  • EDSAC was developed by Maurice Wilkes and his team in 1949. 
.

Very Short Questions

History of computer is based on mainly calculation devices. Therefore it is classified into the following three eras:

  • Mechanical era.
  • Electro-mechanical era.
  • Electronic era.

Mark-I was the first electro mechanical computer developed by Howard Aiken. It was named as ASCC and was 8 ft high, 51 ft long and 2ft wide. It used more than 7 lakh 50 thousand parts and weighed more than 32 tons.

Though Atanasoff Berry computer was the best computer at that time it could not use decimal number system calculations. ENIAC was able to calculate using decimal number system and was 300 times fadter than Atanasoff Berry computer.

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  • Who developed Mark- I?

    Dr. Herman Hollerith
    J.V. Antasoff
    Howard Aiken
    J. Presper Eckert
  • Who developed Antasoff Berry Computer?

    J.V. Antasoff and Clifford Berry
    J.V Antasoff
    Clifford Berry
    Howard Aiken
  • ENIAC was developed by ____________.

    John Mauchlay and J.Presper Eckret
    John Mauchlay
    Chinese people
    J. Presper Eckert
  • Who developed EDSAC?

    William Oughtred
    Charles Babbage
    Howard Aiken
    Maurice Wilkes
  • UNIAC was developed by ____________.

    J. Presper Eckert
    Marie Jackquard
    John Mauchlay
    Gottrified William Von Leibmitz
  • ENIAC was based on ________ number system.

    decimal
    octal
    binary
    none of them
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