The first substantial computer was the giant ENIAC machine by John W. Mauchly and J. Presper Eckert at the University of Pennsylvania. ENIAC (Electrical Numerical Integrator and Calculator) used a word of 10 decimal digits instead of binary ones like previous automated calculators/computers. ENIAC was also the first machine to use more than 2,000 vacuum tubes, using nearly 18,000 vacuum tubes. Storage of all those vacuum tubes and the machinery required to keep the cool took up over 167 square meters (1800 square feet) of floor space. Nonetheless, it had punched-card input and output and arithmetically had 1 multiplier, 1 divider-square rooter, and 20 adders employing decimal "ring counters," which served as adders and also as quick-access (0.0002 seconds) read-write register storage.
The executable instructions composing a program were embodied in the separate units of ENIAC, which were plugged together to form a route through the machine for the flow of computations. These connections had to be redone for each different problem, together with presetting function tables and switches. This "wire-your-own" instruction technique was inconvenient, and only with some license could ENIAC be considered programmable; it was, however, efficient in handling the particular programs for which it had been designed. ENIAC is generally acknowledged to be the first successful high-speed electronic digital computer (EDC) and was productively used from 1946 to 1955. A controversy developed in 1971, however, over the patentability of ENIAC's basic digital concepts, the claim being made that another U.S. physicist, John V. Atanasoff, had already used the same ideas in a simpler vacuum-tube device he built in the 1930s while at Iowa State College. In 1973, the court found in favor of the company using Atanasoff claim and Atanasoff received the acclaim he rightly deserved.
Types of Computers
- Supercomputer and Mainframe
- Minicomputer
- Workstation
- Personal computer
Program System
a program, as an operating system, compiler, orutility program, that controls some aspect of theoperation of a computer
What is Prezi?
Prezi is a visual storytelling software alternative to traditional slide-based presentation formats. Prezi presentations feature a map-like, schematic overview that lets users pan between topics at will, zoom in on desired details, and pull back to reveal context.
This freedom of movement enables “conversational presenting,” a new presentation style in which presentations follow the flow of dialogue, instead of vice-versa.
When Prezi was Founded?
Founded in 2009, and with offices in San Francisco, Budapest, and Mexico City, Prezi now fosters a community of over 75 million users with more than 260 million prezis around the world.
Criticims
he company has acknowledged that the “zooming user interface (ZUI)” has the potential to induce nausea, and offers tutorials with recommendations for use of layout to avoid excessive visual stimulation.
