6. 1. Use of vacuum tubes 2. Big & Clumsy 3. High Electricity Consumption 4. Programming in Mechanical Language 5. Larger AC were needed 6. Lot of electricity failure occured First-generation machines (1942-1960) Other computers of first generation are: UNIVAC-1, IBM-701 and IBM-650, Datamatrix-1000, EDSAC, MARK II, MARK III.
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8. 1. Transistors were used 2. Core Memory was developed 3. Faster than First Generation computers 4. First Operating System was developed 5. Programming was in Machine Language & Aseembly Language 6. Magnetic tapes & discs were used 7. Computers became smaller in size than the First Generation computers 8. Computers consumed less heat & consumed less electricity FEATURES OF SECOND GENERATION (1960-1965) Computers of Second Generation: CDC-3600, IB-700, IBM-1401, ICL-1901, UNIVAC-1108, IBM-7094, RCA-501, CDC-1604
9. 1. Integrated circuits developed 2. Power consumption was low 3. SSI & MSI Technology was used 4. High level languages were used Computers of Third Generation: CDC-1700, ICL-2903, PDP-11/45 THIRD GENERATION FEATURES (1965-1975)
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11. 1. Used in parallel processing 2. Used superconductors 3. Used in speech recognition 4. Used in intelligent robots 5. Used in artificial intelligence FIFTH GENERATION COMPUTERS
![Suanpan (the number represented on this abacus is 6,302,715,408) Yazu Arithmometer. Patented in Japan in 1903. Note the lever for turning the gears of the calculator. ,[object Object],[object Object],Earliest true hardware](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)