PRELIMS Flashcards
earliest calculating tool
Abacus
Built mechanical calculators using pegged wheels that could perform basic arithmetic functions.
Blaise Pascal and Gottfried Leibniz
Designed an analytical engine that performed general calculations automatically
Charles Babbage (1842)
Designed a tabulating machine to record census data.
Herman Hollerith (1890)
Explain Herman Hollerith’s tabulating machine
The tabulating machine stored information as holes in score cards that were interpreted by machines with electrical sensors.
Built the first electronic computer.
John Atansoff and Clifford Berry (1939)
When was the first fully operational working computer built?
December 1943
What was the name of the first fully operational working computer?
Colossus
What can colossus do?
Encrypt German Military Codes
Harvard University (1944)
The first general purpose modern computer was built. It used an Automatic Sequence Controlled Calculator (ASCC) and js very slow and prone to malfuncatuions.
They built the first general purpose electric computer.
J. Presper Eckert and John Mauchly (1946)
Describe the first general purpose computer built by J. Presper Eckert and John Mauchly.
It made use of Electric Numerical Integrator and Calculator. It contained 18000 vacuum tubes and failed 1 in every 7 minutes.
He developed the translator.
William Shockley (1948)
Describe the translator developed by William Shockley.
It is an electronic switch that alternatively allows or does not allow electronic signals. It made the possibility of the development of stored program computer.
They developed the UNIVAC
Eckert and Mauchly (1951)
Describe the UNIVAC developed by Eckert and Mauchly.
The UNIVAC (Universal Automatic Computer) it the first commercially successful general purpose stored program electronic digital computer.
1st Generation
(1938 - 1958)
Used vacuum tube devices
2nd Generation
(1958)
Based on individually packed transistors
3rd Generation
(1964)
Used integrated circuits which consist of many transistor and other electronic elements fused onto a chip
4th Generation
(1975)
Extension of the 3rd generation and incorporated large scale integrated circuits
Computer Language
Computer Language translate what the user input into a series of 1s and 0s. Different Number Systems.
Binary System
The number system starts with 0 and 1
Converting Alphabetic characters, decimal values and logic function to binary values.
Digital Image
made of discrete picture elements (pixel) arranged in a matrix. The size of the image is described by the power of two equivalents.
Enumerate the image sizes
256 x 256
1024 x 1024
2048 x 2048
4096 x 4096