a. cigarettes should not be placed near the computer because of the smoke it causes..
b. books should not be placed near the computer because when it fall, there might be something that will get squeezed.
c. gadgets should not be placed near the computer so that you could feel comfortable.
d. a glass of water should not be placed near the computer so that when accidentally spilled .. the computer will not be affected
e. food should not be placed near the computer so that there wo'nt be insects or whatever pests surrounding your computer.
f. and the surrounding of the computer should always be clean .
Martes, Agosto 9, 2011
Sabado, Agosto 6, 2011
Lunes, Hulyo 25, 2011
TYPES OF COMPUTERS
PC: Abbreviation for "Personal Computer," 93% of the computer population uses PCs. PCs for personal use come in almost any shape and design, they usually run Microsoft Windows (for example, Windows XP, Vista, or Windows 7), are exceptionally fast, and are compatible with almost all available computer applications. Most large-scale businesses, corporations, schools, and home users operate PCs due to their customizable features, performance, and generally low price. Leading PC manufacturers include Dell, HP, Samsung, Sony, Toshiba, and many others.
===
It should be mentioned that when people refer to a PC in general conversation, they are (almost always) referring to a Microsoft Windows compatible personal computer. These computers are not limited to running the Windows family of operating systems, but their architecture is compatible with the requirements of claiming compatibility. Historically, these would have been explained as "IBM PC" or "IBM Clone" computers.
PC's in general can function as servers or workstations, depending on their implementation. These may be graded, or configured as:
Personal use - Most commonly thought of as a "PC"
Business Class Workstation - the "PC" qualification starts getting a little grey here.
Business Class Server - no longer considered a "PC"
Laptop: A compact, battery powered version of a PC. Also called a "Notebook."
Macs: Even though the Mac (short for "Macintosh") is a form of personal computer, it is different from a PC because it does not use Microsoft Windows as the Operating System. Instead, it uses the Mac OS series, such as OS X Leopard.
Macs are known for their incredible system stability, quality designs, unique programs and features, and their usually fast speed. Macs are becoming more popular in society, generally used in peoples' homes or in digital graphic design studios. Unfortunately, many people do not invest their money in a Mac because of a Mac's steep price (a $1500 Dell PC is about the same price of a $2400 Apple Macktintosh--both with the same specifications) and the lack of many compatible programs made specifically for Macs (although the number is increasing).
Mainframe : Computers with large Hard Drives, lots of Memory (RAM), multiple CPUs running together, which perform large amounts of computing depending upon the speed of the processors used and amount of RAM included.
Micro Computer : A very small computer, usually used in cameras.
Super Computer : A computer with lots of processors, Memory (RAM), etc. Usually used in scientific research work or they are used by the government. For large manufacturers, a supercomputer typically "breaks down" problems, solves them in small "bits," and then puts the problem "back together." They have a capability of 14,000 micro computers.
PDA: "Personal Digital Assistant" or Palmtop.
Analog : Older, out-dated computers. They calculate physical Quantities such as voltage, etc...
Digital: Computers which use binary digits (zeros and ones) for processing. Almost all electronic computing devices are digital, including PCs, Macs, and Servers.
Server: A computer with great processing power that receives and performs requests from other computers.
What the above answers are stating are names/applications/types of electronic computers. Electronic computers can be subdivided into analog or digital. At a basic level, all digital electronic computers are composed of several parts - including input/output (LCDs, LEDs, keypads, printers, etc.), a processor (often includes an arithmetic logic unit, controller, registers, etc., but doesn't necessarily need to contain all of these), and memory. Analog computers were the predecessors of these digital computers, and are still used in some applications today.
A "computer" is simply something used for performing calculations. A "long" time ago (World War 2), Computer was a title/job description, literally meaning someone who did computations. This definition would also stretch computer to cover mechanical devices, such as the enigma machines used in WW2 for ciphers (by the Germans).
A: Names application random subjects of references but it still boils down to a three components. A German machine did not do computations but rather simplify the process of elimination.
HISTORY OF COMPUTERS
This chapter is a brief summary of the history of Computers. It is supplemented by the two PBS documentaries video tapes "Inventing the Future" And "The Paperback Computer". The chapter highlights some of the advances to look for in the documentaries.
In particular, when viewing the movies you should look for two things:
The progression in hardware representation of a bit of data:
Vacuum Tubes (1950s) - one bit on the size of a thumb;
Transistors (1950s and 1960s) - one bit on the size of a fingernail;
Integrated Circuits (1960s and 70s) - thousands of bits on the size of a hand
Silicon computer chips (1970s and on) - millions of bits on the size of a finger nail.
The progression of the ease of use of computers:
Almost impossible to use except by very patient geniuses (1950s);
Programmable by highly trained people only (1960s and 1970s);
Useable by just about anyone (1980s and on).
to see how computers got smaller, cheaper, and easier to use.
First Computers
Eniac Computer
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.
Progression of Hardware
In the 1950's two devices would be invented that would improve the computer field and set in motion the beginning of the computer revolution. The first of these two devices was the transistor. Invented in 1947 by William Shockley, John Bardeen, and Walter Brattain of Bell Labs, the transistor was fated to oust the days of vacuum tubes in computers, radios, and other electronics.
Vaccum Tubes
The vacuum tube, used up to this time in almost all the computers and calculating machines, had been invented by American physicist Lee De Forest in 1906. The vacuum tube, which is about the size of a human thumb, worked by using large amounts of electricity to heat a filament inside the tube until it was cherry red. One result of heating this filament up was the release of electrons into the tube, which could be controlled by other elements within the tube. De Forest's original device was a triode, which could control the flow of electrons to a positively charged plate inside the tube. A zero could then be represented by the absence of an electron current to the plate; the presence of a small but detectable current to the plate represented a one.
Transistors
Vacuum tubes were highly inefficient, required a great deal of space, and needed to be replaced often. Computers of the 1940s and 50s had 18,000 tubes in them and housing all these tubes and cooling the rooms from the heat produced by 18,000 tubes was not cheap. The transistor promised to solve all of these problems and it did so. Transistors, however, had their problems too. The main problem was that transistors, like other electronic components, needed to be soldered together. As a result, the more complex the circuits became, the more complicated and numerous the connections between the individual transistors and the likelihood of faulty wiring increased.
In 1958, this problem too was solved by Jack St. Clair Kilby of Texas Instruments. He manufactured the first integrated circuit or chip. A chip is really a collection of tiny transistors which are connected together when the transistor is manufactured. Thus, the need for soldering together large numbers of transistors was practically nullified; now only connections were needed to other electronic components. In addition to saving space, the speed of the machine was now increased since there was a diminished distance that the electrons had to follow.
Circuit Board Silicon Chip
Mainframes to PCs
The 1960s saw large mainframe computers become much more common in large industries and with the US military and space program. IBM became the unquestioned market leader in selling these large, expensive, error-prone, and very hard to use machines.
A veritable explosion of personal computers occurred in the early 1970s, starting with Steve Jobs and Steve Wozniak exhibiting the first Apple II at the First West Coast Computer Faire in San Francisco. The Apple II boasted built-in BASIC programming language, color graphics, and a 4100 character memory for only $1298. Programs and data could be stored on an everyday audio-cassette recorder. Before the end of the fair, Wozniak and Jobs had secured 300 orders for the Apple II and from there Apple just took off.
Also introduced in 1977 was the TRS-80. This was a home computer manufactured by Tandy Radio Shack. In its second incarnation, the TRS-80 Model II, came complete with a 64,000 character memory and a disk drive to store programs and data on. At this time, only Apple and TRS had machines with disk drives. With the introduction of the disk drive, personal computer applications took off as a floppy disk was a most convenient publishing medium for distribution of software.
IBM, which up to this time had been producing mainframes and minicomputers for medium to large-sized businesses, decided that it had to get into the act and started working on the Acorn, which would later be called the IBM PC. The PC was the first computer designed for the home market which would feature modular design so that pieces could easily be added to the architecture. Most of the components, surprisingly, came from outside of IBM, since building it with IBM parts would have cost too much for the home computer market. When it was introduced, the PC came with a 16,000 character memory, keyboard from an IBM electric typewriter, and a connection for tape cassette player for $1265.
By 1984, Apple and IBM had come out with new models. Apple released the first generation Macintosh, which was the first computer to come with a graphical user interface(GUI) and a mouse. The GUI made the machine much more attractive to home computer users because it was easy to use. Sales of the Macintosh soared like nothing ever seen before. IBM was hot on Apple's tail and released the 286-AT, which with applications like Lotus 1-2-3, a spreadsheet, and Microsoft Word, quickly became the favourite of business concerns.
That brings us up to about ten years ago. Now people have their own personal graphics workstations and powerful home computers. The average computer a person might have in their home is more powerful by several orders of magnitude than a machine like ENIAC. The computer revolution has been the fastest growing technology in man's history.
PC: Abbreviation for "Personal Computer," 93% of the computer population uses PCs. PCs for personal use come in almost any shape and design, they usually run Microsoft Windows (for example, Windows XP, Vista, or Windows 7), are exceptionally fast, and are compatible with almost all available computer applications. Most large-scale businesses, corporations, schools, and home users operate PCs due to their customizable features, performance, and generally low price. Leading PC manufacturers include Dell, HP, Samsung, Sony, Toshiba, and many others.
===
It should be mentioned that when people refer to a PC in general conversation, they are (almost always) referring to a Microsoft Windows compatible personal computer. These computers are not limited to running the Windows family of operating systems, but their architecture is compatible with the requirements of claiming compatibility. Historically, these would have been explained as "IBM PC" or "IBM Clone" computers.
PC's in general can function as servers or workstations, depending on their implementation. These may be graded, or configured as:
Personal use - Most commonly thought of as a "PC"
Business Class Workstation - the "PC" qualification starts getting a little grey here.
Business Class Server - no longer considered a "PC"
Laptop: A compact, battery powered version of a PC. Also called a "Notebook."
Macs: Even though the Mac (short for "Macintosh") is a form of personal computer, it is different from a PC because it does not use Microsoft Windows as the Operating System. Instead, it uses the Mac OS series, such as OS X Leopard.
Macs are known for their incredible system stability, quality designs, unique programs and features, and their usually fast speed. Macs are becoming more popular in society, generally used in peoples' homes or in digital graphic design studios. Unfortunately, many people do not invest their money in a Mac because of a Mac's steep price (a $1500 Dell PC is about the same price of a $2400 Apple Macktintosh--both with the same specifications) and the lack of many compatible programs made specifically for Macs (although the number is increasing).
Mainframe : Computers with large Hard Drives, lots of Memory (RAM), multiple CPUs running together, which perform large amounts of computing depending upon the speed of the processors used and amount of RAM included.
Micro Computer : A very small computer, usually used in cameras.
Super Computer : A computer with lots of processors, Memory (RAM), etc. Usually used in scientific research work or they are used by the government. For large manufacturers, a supercomputer typically "breaks down" problems, solves them in small "bits," and then puts the problem "back together." They have a capability of 14,000 micro computers.
PDA: "Personal Digital Assistant" or Palmtop.
Analog : Older, out-dated computers. They calculate physical Quantities such as voltage, etc...
Digital: Computers which use binary digits (zeros and ones) for processing. Almost all electronic computing devices are digital, including PCs, Macs, and Servers.
Server: A computer with great processing power that receives and performs requests from other computers.
What the above answers are stating are names/applications/types of electronic computers. Electronic computers can be subdivided into analog or digital. At a basic level, all digital electronic computers are composed of several parts - including input/output (LCDs, LEDs, keypads, printers, etc.), a processor (often includes an arithmetic logic unit, controller, registers, etc., but doesn't necessarily need to contain all of these), and memory. Analog computers were the predecessors of these digital computers, and are still used in some applications today.
A "computer" is simply something used for performing calculations. A "long" time ago (World War 2), Computer was a title/job description, literally meaning someone who did computations. This definition would also stretch computer to cover mechanical devices, such as the enigma machines used in WW2 for ciphers (by the Germans).
A: Names application random subjects of references but it still boils down to a three components. A German machine did not do computations but rather simplify the process of elimination.
HISTORY OF COMPUTERS
This chapter is a brief summary of the history of Computers. It is supplemented by the two PBS documentaries video tapes "Inventing the Future" And "The Paperback Computer". The chapter highlights some of the advances to look for in the documentaries.
In particular, when viewing the movies you should look for two things:
The progression in hardware representation of a bit of data:
Vacuum Tubes (1950s) - one bit on the size of a thumb;
Transistors (1950s and 1960s) - one bit on the size of a fingernail;
Integrated Circuits (1960s and 70s) - thousands of bits on the size of a hand
Silicon computer chips (1970s and on) - millions of bits on the size of a finger nail.
The progression of the ease of use of computers:
Almost impossible to use except by very patient geniuses (1950s);
Programmable by highly trained people only (1960s and 1970s);
Useable by just about anyone (1980s and on).
to see how computers got smaller, cheaper, and easier to use.
First Computers
Eniac Computer
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.
Progression of Hardware
In the 1950's two devices would be invented that would improve the computer field and set in motion the beginning of the computer revolution. The first of these two devices was the transistor. Invented in 1947 by William Shockley, John Bardeen, and Walter Brattain of Bell Labs, the transistor was fated to oust the days of vacuum tubes in computers, radios, and other electronics.
Vaccum Tubes
The vacuum tube, used up to this time in almost all the computers and calculating machines, had been invented by American physicist Lee De Forest in 1906. The vacuum tube, which is about the size of a human thumb, worked by using large amounts of electricity to heat a filament inside the tube until it was cherry red. One result of heating this filament up was the release of electrons into the tube, which could be controlled by other elements within the tube. De Forest's original device was a triode, which could control the flow of electrons to a positively charged plate inside the tube. A zero could then be represented by the absence of an electron current to the plate; the presence of a small but detectable current to the plate represented a one.
Transistors
Vacuum tubes were highly inefficient, required a great deal of space, and needed to be replaced often. Computers of the 1940s and 50s had 18,000 tubes in them and housing all these tubes and cooling the rooms from the heat produced by 18,000 tubes was not cheap. The transistor promised to solve all of these problems and it did so. Transistors, however, had their problems too. The main problem was that transistors, like other electronic components, needed to be soldered together. As a result, the more complex the circuits became, the more complicated and numerous the connections between the individual transistors and the likelihood of faulty wiring increased.
In 1958, this problem too was solved by Jack St. Clair Kilby of Texas Instruments. He manufactured the first integrated circuit or chip. A chip is really a collection of tiny transistors which are connected together when the transistor is manufactured. Thus, the need for soldering together large numbers of transistors was practically nullified; now only connections were needed to other electronic components. In addition to saving space, the speed of the machine was now increased since there was a diminished distance that the electrons had to follow.
Circuit Board Silicon Chip
Mainframes to PCs
The 1960s saw large mainframe computers become much more common in large industries and with the US military and space program. IBM became the unquestioned market leader in selling these large, expensive, error-prone, and very hard to use machines.
A veritable explosion of personal computers occurred in the early 1970s, starting with Steve Jobs and Steve Wozniak exhibiting the first Apple II at the First West Coast Computer Faire in San Francisco. The Apple II boasted built-in BASIC programming language, color graphics, and a 4100 character memory for only $1298. Programs and data could be stored on an everyday audio-cassette recorder. Before the end of the fair, Wozniak and Jobs had secured 300 orders for the Apple II and from there Apple just took off.
Also introduced in 1977 was the TRS-80. This was a home computer manufactured by Tandy Radio Shack. In its second incarnation, the TRS-80 Model II, came complete with a 64,000 character memory and a disk drive to store programs and data on. At this time, only Apple and TRS had machines with disk drives. With the introduction of the disk drive, personal computer applications took off as a floppy disk was a most convenient publishing medium for distribution of software.
IBM, which up to this time had been producing mainframes and minicomputers for medium to large-sized businesses, decided that it had to get into the act and started working on the Acorn, which would later be called the IBM PC. The PC was the first computer designed for the home market which would feature modular design so that pieces could easily be added to the architecture. Most of the components, surprisingly, came from outside of IBM, since building it with IBM parts would have cost too much for the home computer market. When it was introduced, the PC came with a 16,000 character memory, keyboard from an IBM electric typewriter, and a connection for tape cassette player for $1265.
By 1984, Apple and IBM had come out with new models. Apple released the first generation Macintosh, which was the first computer to come with a graphical user interface(GUI) and a mouse. The GUI made the machine much more attractive to home computer users because it was easy to use. Sales of the Macintosh soared like nothing ever seen before. IBM was hot on Apple's tail and released the 286-AT, which with applications like Lotus 1-2-3, a spreadsheet, and Microsoft Word, quickly became the favourite of business concerns.
That brings us up to about ten years ago. Now people have their own personal graphics workstations and powerful home computers. The average computer a person might have in their home is more powerful by several orders of magnitude than a machine like ENIAC. The computer revolution has been the fastest growing technology in man's history.
Miyerkules, Hulyo 20, 2011
Miyerkules, Hulyo 6, 2011
Gardner's Theory ( HOMEWORK )
I am PEOPLE SMART .
-->> I am people smart because I can interact or communicate with other peoples well.
I am a bit NUMBER SMART.
-->> When I was in elementary.. I was competed in Mtap and i join a lot of trainings for Mathematics.
I am a bit BODY SMART.
-->> i play sports ..
-->> I am people smart because I can interact or communicate with other peoples well.
I am a bit NUMBER SMART.
-->> When I was in elementary.. I was competed in Mtap and i join a lot of trainings for Mathematics.
I am a bit BODY SMART.
-->> i play sports ..
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