(3)UAIUA
It stands for Universal Automatic Computer developed by J.P eckret & DR. John Mouchly in 1961.It was capable of processing alpha numeric data & based on the concept of stored memory of John newman.It was used for business data processing which was the first computer manufactured for commercial use & general purpose digital computer.

(4)EDSA
It stands for Electronic Delay Storage Automatic Computer.altough the concept of store programme was introduced EDVAC,EDSAC was the first computer implementing this concept.It was designed by Mauric Willes in 1947.It is used as Mercury delay line storage system where the exess time was 1 mini second.It contains 3,000 vacum tubes & operated on 30 kilo watt.

History of computer in Nepal:
-First ‘Facit’ named calculating device was brought in
2018 B.S. for census purpose.


-In 2028B.S. “IBM 1401” was the first computer computer brought in Nepal which was the second generation of computer.

-During 2039 B.S. different types of computer like ‘Sirus’ ,‘Apple Mac’ e.t.c. was brought.

-Till now we are using laptops,palmtops e.t.c. & the technology is still using.

#Generation of computer

(1)Rise in step of technology
The step of technology in computer system is termed as generation of computer.Simply the generation of computer Each generation is distinguish from others on the basis of the type of switching circuits.
There are five generation of computer:

Generation Duration Components
First 1943-1958 Vacum tubes
Second 1959-1965 Tansistors
Third 1966-1973 IC-chips
Fourth 1974-Till Mcro -chips
Fifth Future Bio chips




First generation of computer
The first generation of computer were developed in 1943-1958 A.D.They use the vacuum tubes as the switching device.Lee De forest first developed vacuum tubes.

#Features of first generation of computer.
1)Very long in sieze,very slow.
2)Consume high power & produce large amount of heat.
3)They have slow speed,operating & limited computing & storage capacity (1-4B)1024+1024 Byte.
4)Programming was done in machine level language.
5)Programming was difficult & expensive eg:ENIAC,EDVAC,UNIAL,IBM650IBM701 e.t.c.


Second generation of computer
The second generation of computer was developed during 1959-1965 A.D.Tey use they use the transistors as the main switching device.John Barden &Willium B.shockley developed.

Features if seeond generation of computer
-They were smaller than first generation of computer
-They consumed less power & produced less heat in comparism to first generation of computer.
-They are faster & more reliable in processing.
-Less costly & capable of storing largeamount of data.
-Programming would be done in high level language like ‘CBOL’(Common Business Oriented Language)
-the operating speed was in terms of microsecond. eg:IBM 1401,IBM1620,CDC3600,CDC1804 e.t.c.

Third generation of computer
The third generation of computer was generated/developed during 1966-1973.They used IC Chips as the major components.Jack Clair Kilby developed it.
An Ic Chip is a circuit with number of transistors integrated on a small silicon chip.The main features of this generation of computer are as follows:
-They are small efficient & reliable.
-Operating speed was in terms of nano second.
- Semi-conductor memory was used as primary memory, magnetic disk was used as secondary memory.
-Understanding large numbers of high level languages eg:FORTAN(Formula Translation Pascal )e.t.c.-Input & output devices such as keyboard & moniters were used Eg: IBM 360,IBM 370,ICL 1900,VAX 750PDP-II