computer generation

1. JSS MAHAVIDYAPEETHA MYSORE-04
JSS INSTITUTE OF EDUCATIION
SAKLESHPUR-573134
SUBIMITED BY:
RAVIKUMAR B.P

4. 1.FIRST GENERATION{1950-1959}:
 BASED ON VACUUM TUBE DESIGN.
 GIGANTIC SIZE.
 SPEEDS WERE MEASURED IN “MULTI” SECONDS RANGE.
 ENORMOUS AMOUNT OF HEAT DISSIPATION RESULTING IN USE OG
LARGE AIR CONDITIONING UNITS.
 USED GREAT DEAL OF ELECTRICAL POWER TO OPERATE AND TUBES
WERE NOTORIOUSLY UNRELIABLE.
 PROGRAMMING WAS DONE USING MACHINE LANGUAGES.
EG; IBM-650,IBM702,704,705 AND 709 UNIVAC-1,UNIVAC-11

5. 2.SECOND GENERATION{1960-
1965}
 BASED ON SOLID STATE TRANSISTOR.
 TRANSISTOR WAS MANY TIMES LESS IN SIZE.
 LESS POWER CONSUMPTION, LESS HEAT GENERATION.
 IMPROVED RELIABILITY.
 SPEEDS WERE MEASURED IN “MICRO” SECONDS.
 PROGRAMMING WAS DONE IN SYMBOLIC LANGUAGES.
 SOME PROGRAMMING LANGUAGES LIKE COBAL, FRORTRAN AND THEIR
COMPILERS WERE DEVELOPED.
EG:I IBM-1400,IBM-7000,BURROUGHS B5000, UNIVAC111,NCR-304 CDC-1604.

6.  INTEGRATED CIRCUITS (IC’S) USED IN BUILDING COMPUTERS.
 SMALLER IN SIZE, LESS POWER CONSUMPTION, AND LESS HEAT DISSIPATION.
 FASTER IN OPERATION. SPEEDS ARE MEASURED BOTH IN MICROSECONDS AND NANO
SECONDS.
 MULTI PROGRAMMING OPERATING SYSTEMS.
 ON-LINE SYSTEMS WITH REMOTE TERMINALS.
 PROGRAMMING LANGUAGES ARE IMPROVED. NEW LANGUAGES CREATED ARE ALGOL,
PASCAL, LISP, ADA. ETC.
EG: UNIVAC 9000SERIES, NCR CENTURY, TDC-316,312 AND 332 IBM360 SERIES BURROUGHS-
6500,7500,8500.

7. 4. FOURTH GENERATION {1975
PRESENT}
 NO CLEAR DISTINCTION LIKE PREVIOUS GENERATIONS.
 FURTHER REFINEMENT AND MINIATURIZATION.
 USED VLSI TECHNOLOGY (LSI ALSO)
 VLSI COULD PACK TENS OF THOUSANDS OF CIRCUITS INTO THE SAME
COMPACT SPACE.
 CONCEPT OF “VIRTUAL STORAGE” (USING DISC MEMORY AS EXTENSION TO
MAIN STORAGE).