The Electronic Age: 1940 - Present.
1. First Tries.
- Early 1940s
- Electronic vacuum tubes.
2. Eckert and Mauchly.
- The First High-Speed, General-Purpose Computer Using Vacuum Tubes: Electronic Numerical Integrator and Computer (ENIAC)The ENIAC team (Feb 14, 1946). Left to right: J. Presper Eckert, Jr.; John Grist Brainerd; Sam Feltman; Herman H. Goldstine; John W. Mauchly; Harold Pender; Major General G. L. Barnes; Colonel Paul N. Gillon.
· Electronic Numerical Integrator and Computer (ENIAC)
- 1946.
- Used vacuum tubes (not mechanical devices) to do its calculations (Hence, first electronic computer).
- Developers John Mauchly, a physicist, and J. Prosper Eckert, an electrical engineer
(The Moore School of Electrical Engineering at the University of Pennsylvania)
- Funded by the U.S. Army.
- But it could not store its programs (its set of instructions)
- The First Stored-Program Computer(s)
- Early 1940s, Mauchly and Eckert began to design the EDVAC - the Electronic Discreet Variable Computer.
- John von Neumann's influential report in June 1945: "The Report on the EDVAC"
- British scientists used this report and outpaced the Americans. (Max Newman headed up the effort at Manchester University ), Where the Manchester Mark I went into operation in June 1948--becoming the first stored-program computer. (Maurice Wilkes, a British scientist at Cambridge University, completed the EDSAC (Electronic Delay Storage Automatic Calculator) in 1949--two years before EDVAC was finished. ), thus, EDSAC became the first stored-program computer in general use (i.e., not a prototype).
- The First General-Purpose Computer for Commercial Use: Universal Automatic Computer (UNIVAC).
· Late 1940s, Eckert and Mauchly began the development of a computer called UNIVAC (Universal Automatic Computer) : Remington Rand, First UNIVAC delivered to Census Bureau in 1951.
· But, a machine called LEO (Lyons Electronic Office) went into action a few months before UNIVAC and became the world's first commercial computer.
3. The Four Generations of Digital Computing.
- The First Generation (1951-1958).
1. Vacuum tubes as their main logic elements.
2. Punch cards to input and externally store data.
3. Rotating magnetic drums for internal storage of data and programs
- Programs written in:
- Machine language
- Assembly language->Requires a compiler. - The Second Generation (1959-1963).
1. Vacuum tubes replaced by transistors as main logic element.
- AT&T's Bell Laboratories, in the 1940s
- Crystalline mineral materials called semiconductors could be used in the design of a device called a transistor
2. Magnetic tape and disks began to replace punched cards as external storage devices.
3. Magnetic cores (very small donut-shaped magnets that could be polarized in one of two directions to represent data) strung on wire within the computer became the primary internal storage technology.
- High-level programming languages
- E.g., FORTRAN and COBOL - The Third Generation (1964-1979).
· Individual transistors were replaced by integrated circuits.
· Magnetic tape and disks completely replace punch cards as external storage devices.
· Magnetic core internal memories began to give way to a new form, metal oxide semiconductor (MOS) memory, which, like integrated circuits, used silicon-backed chips.
o Operating systems
o Advanced programming languages like BASIC developed.
- Which is where Bill Gates and Microsoft got their start in 1975. - The Fourth Generation (1979- Present).
1. Large-scale and very large-scale integrated circuits (LSIs and VLSICs)
2. Microprocessors that contained memory, logic, and control circuits (an entire CPU = Central Processing Unit) on a single chip.
o Which allowed for home-use personal computers or PCs, like the Apple (II and Mac) and IBM PC.
- Apple II released to public in 1977, by Stephen Wozniak and Steven Jobs.
- Initially sold for $1,195 (without a monitor); had 16k RAM.
- First Apple Mac released in 1984.
- IBM PC introduced in 1981.
- Debuts with MS-DOS (Microsoft Disk Operating System)
o Fourth generation language software products
- E.g., Visicalc, Lotus 1-2-3, dBase, Microsoft Word, and many others.
- Graphical User Interfaces (GUI) for PCs arrive in early 1980s
· MS Windows debuts in 1983, but is quite a clunker.
· Windows wouldn't take off until version 3 was released in 1990
· Apple's GUI (on the first Mac) debuts in 1984.
Reference by this Bibliography:
- Kenneth C. Laudon, Carol Guercio Traver, Jane P. Laudon, Information Technology and Systems, Cambridge, MA: Course Technology, 1996.
- Stan Augarten, BIT By BIT: An Illustrated History of Computers (New York: Ticknor & Fields, 1984).
- R. Moreau, The Computer Comes of Age: The People, the Hardware, and the Software, translated by J. Howlett (Cambridge: MIT Press, 1984).
- Telephone History Web Site. http://www.cybercomm.net/~chuck/phones.html, accessed 1998.
- Microsoft Museum. http://www.microsoft.com/mscorp/museum/home.asp, accessed 1998.