1. Bilbao, Kyle Joel D. Chiong, Noelle A. Reymundo, Kim Muriel S. FIRST GENERATION OF COMPUTER: 1942-1955

2. FIRST GENERATION OF COMPUTERS During the period of 1940 to 1956 first generation of computers were developed. The first generation computers used vacuum tubes for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms. The vacuum tube was developed by Lee DeForest. A vacuum tube is a device generally used to amplify a signal by controlling the movement of electrons in an evacuated space.

3. First generation computers were large size and very costly and used the assembly language for programming.

4. CHARACTERISTICS OF 1 ST GEN COMPUTERS 1) First generation computers were based on vacuum tubes. 2) The operating systems of the first generation computers were very slow. 3) They were very large in size. 4) Production of the heat was in large amount in first generation computers. 5) Machine language was used for programming. 6) First generation computers were unreliable. 7) They were difficult to program and use.

5. A PIECE OF HISTORY Colossus - first electronic computer of this era - It's every aspect was kept secret by British Government. In 1945, Von Neumann Architecture was introduced. Eckert and Mauchley began working on EDVAC (Electronic Discrete Variable Automatic Computer) but it never completed. Later Von Neumann developed his own EDVAC (IAS machine). In 1946, the development of ENIAC (Electronic Numerical Integrator and Computer), which was started in 1943, was completed.

6. OTHER COMPUTERS OF THE 1 ST GEN UNIVAC MARK II MARK III Z2 Z4 SSEC (Selective Sequence Electronic calculator) Some IBM computers series such as: - IBM 604, IBM 650, IBM 701, IBM 702 In 1954, first version of FORTRAN (Formula Translator) was published by IBM.

7. VACUUM TUBES Basic components for memory and circuitry for CPU (Central Processing Unit) of First Generation computers. Produced a lot of heat and were prone to frequent fusing of the installations Very expensive and could be afforded only by very large organizations

8. Batch processing operating systems were used in the First Generation such as: Punched cards Paper tape Magnetic tape Input & Output device Machine codes Electric wired board languages

9. Main Features of First Generation Computers Vacuum Tube Technology Unreliable Supported Machine Language Only Very Costly Generate A Lot Of Heat Slow Input/Output Device Huge Size Need of A.C. Non-portable Consumed A Lot Of Electricity