Information on computer

General Keyboard Shortcuts ( For Windows only)

2010-09-09T08:54:00.001-07:00

CTRL+C (Copy)
CTRL+X (Cut)
CTRL+V (Paste)
CTRL+Z (Undo)
DELETE (Delete)
SHIFT+DELETE (Delete the selected item permanently without placing the item in the Recycle Bin)
CTRL while dragging an item (Copy the selected item)
CTRL+SHIFT while dragging an item (Create a shortcut to the selected item)
F2 key (Rename the selected item)
CTRL+RIGHT ARROW (Move the insertion point to the beginning of the next word)
CTRL+LEFT ARROW (Move the insertion point to the beginning of the previous word)
CTRL+DOWN ARROW (Move the insertion point to the beginning of the next paragraph)
CTRL+UP ARROW (Move the insertion point to the beginning of the previous paragraph)
CTRL+SHIFT with any of the arrow keys (Highlight a block of text)
SHIFT with any of the arrow keys (Select more than one item in a window or on the desktop, or select text in a document)
CTRL+A (Select all)
F3 key (Search for a file or a folder)
ALT+ENTER (View the properties for the selected item)
ALT+F4 (Close the active item, or quit the active program)
ALT+ENTER (Display the properties of the selected object)
ALT+SPACEBAR (Open the shortcut menu for the active window)
CTRL+F4 (Close the active document in programs that enable you to have multiple documents open simultaneously)
ALT+TAB (Switch between the open items)
ALT+ESC (Cycle through items in the order that they had been opened)
F6 key (Cycle through the screen elements in a window or on the desktop)
F4 key (Display the Address bar list in My Computer or Windows Explorer)
SHIFT+F10 (Display the shortcut menu for the selected item)
ALT+SPACEBAR (Display the System menu for the active window)
CTRL+ESC (Display the Start menu)
ALT+Underlined letter in a menu name (Display the corresponding menu)
Underlined letter in a command name on an open menu (Perform the corresponding command)
F10 key (Activate the menu bar in the active program)
RIGHT ARROW (Open the next menu to the right, or open a submenu)
LEFT ARROW (Open the next menu to the left, or close a submenu)
F5 key (Update the active window)
BACKSPACE (View the folder one level up in My Computer or Windows Explorer)
ESC (Cancel the current task)
SHIFT when you insert a CD-ROM into the CD-ROM drive (Prevent the CD-ROM from automatically playing)
Dialog Box Keyboard Shortcuts
CTRL+TAB (Move forward through the tabs)
CTRL+SHIFT+TAB (Move backward through the tabs)
TAB (Move forward through the options)
SHIFT+TAB (Move backward through the options)
ALT+Underlined letter (Perform the corresponding command or select the corresponding option)
ENTER (Perform the command for the active option or button)
SPACEBAR (Select or clear the check box if the active option is a check box)
Arrow keys (Select a button if the active option is a group of option buttons)
F1 key (Display Help)
F4 key (Display the items in the active list)
BACKSPACE (Open a folder one level up if a folder is selected in the Save As or Open dialog box)
Microsoft Natural Keyboard Shortcuts
Windows Logo (Display or hide the Start menu)
Windows Logo+BREAK (Display the System Properties dialog box)
Windows Logo+D (Display the desktop)
Windows Logo+M (Minimize all of the windows)
Windows Logo+SHIFT+M (Restore the minimized windows)
Windows Logo+E (Open My Computer)
Windows Logo+F (Search for a file or a folder)
CTRL+Windows Logo+F (Search for computers)
Windows Logo+F1 (Display Windows Help)
Windows Logo+ L (Lock the keyboard)
Windows Logo+R (Open the Run dialog box)
Windows Logo+U (Open Utility Manager)
Accessibility Keyboard Shortcuts
Right SHIFT for eight seconds (Switch FilterKeys either on or off)
Left ALT+left SHIFT+PRINT SCREEN (Switch High Contrast either on or off)
Left ALT+left SHIFT+NUM LOCK (Switch the MouseKeys either on or off)
SHIFT five times (Switch the StickyKeys either on or off)
NUM LOCK for five seconds (Switch the ToggleKeys either on or off)
Windows Logo +U (Open Utility Manager)
Windows Explorer Keyboard Shortcuts
END (Display the bottom of the active window)
HOME (Display the top of the active window)
NUM LOCK+Asterisk sign (*) (Display all of the subfolders that are under the selected folder)
NUM LOCK+Plus sign (+) (Display the contents of the selected folder)
NUM LOCK+Minus sign (-) (Collapse the selected folder)
LEFT ARROW (Collapse the current selection if it is expanded, or select the parent folder)
RIGHT ARROW (Display the current selection if it is collapsed, or select the first subfolder)
Shortcut Keys for Character Map
After you double-click a character on the grid of characters, you can move through the grid by using the keyboard shortcuts:
RIGHT ARROW (Move to the right or to the beginning of the next line)
LEFT ARROW (Move to the left or to the end of the previous line)
UP ARROW (Move up one row)
DOWN ARROW (Move down one row)
PAGE UP (Move up one screen at a time)
PAGE DOWN (Move down one screen at a time)
HOME (Move to the beginning of the line)
END (Move to the end of the line)
CTRL+HOME (Move to the first character)
CTRL+END (Move to the last character)
SPACEBAR (Switch between Enlarged and Normal mode when a character is selected)
Microsoft Management Console (MMC) Main Window Keyboard Shortcuts
CTRL+O (Open a saved console)
CTRL+N (Open a new console)
CTRL+S (Save the open console)
CTRL+M (Add or remove a console item)
CTRL+W (Open a new window)
F5 key (Update the content of all console windows)
ALT+SPACEBAR (Display the MMC window menu)
ALT+F4 (Close the console)
ALT+A (Display the Action menu)
ALT+V (Display the View menu)
ALT+F (Display the File menu)
ALT+O (Display the Favorites menu)
MMC Console Window Keyboard Shortcuts
CTRL+P (Print the current page or active pane)
ALT+Minus sign (-) (Display the window menu for the active console window)
SHIFT+F10 (Display the Action shortcut menu for the selected item)
F1 key (Open the Help topic, if any, for the selected item)
F5 key (Update the content of all console windows)
CTRL+F10 (Maximize the active console window)
CTRL+F5 (Restore the active console window)
ALT+ENTER (Display the Properties dialog box, if any, for the selected item)
F2 key (Rename the selected item)
CTRL+F4 (Close the active console window. When a console has only one console window, this shortcut closes the console)
Remote Desktop Connection Navigation
CTRL+ALT+END (Open the Microsoft Windows NT Security dialog box)
ALT+PAGE UP (Switch between programs from left to right)
ALT+PAGE DOWN (Switch between programs from right to left)
ALT+INSERT (Cycle through the programs in most recently used order)
ALT+HOME (Display the Start menu)
CTRL+ALT+BREAK (Switch the client computer between a window and a full screen)
ALT+DELETE (Display the Windows menu)
CTRL+ALT+Minus sign (-) (Place a snapshot of the active window in the client on the Terminal server clipboard and provide the same functionality as pressing PRINT SCREEN on a local computer.)
CTRL+ALT+Plus sign (+) (Place a snapshot of the entire client window area on the Terminal server clipboard and provide the same functionality as pressing ALT+PRINT SCREEN on a local computer.)
Microsoft Internet Explorer Navigation
CTRL+B (Open the Organize Favorites dialog box)
CTRL+E (Open the Search bar)
CTRL+F (Start the Find utility)
CTRL+H (Open the History bar)
CTRL+I (Open the Favorites bar)
CTRL+L (Open the Open dialog box)
CTRL+N (Start another instance of the browser with the same Web address)
CTRL+O (Open the Open dialog box, the same as CTRL+L)
CTRL+P (Open the Print dialog box)
CTRL+R (Update the current Web page)
CTRL+W (Close the current window)

COMPUTER AND ITS HISTORY

2010-09-04T02:42:00.000-07:00

Way to science

Computer is a programmable machine that receives input, stores and manipulates data//information, and provides output in a useful format.

While a computer can, in theory, be made out of almost anything (see misconceptions section), and mechanical examples of computers have existed through much of recorded human history, the first electronic computers were developed in the mid-20th century (1940–1945). Originally, they were the size of a large room, consuming as much power as several hundred modern personal computers (PCs). Modern computers based on integrated circuits are millions to billions of times more capable than the early machines, and occupy a fraction of the space. Simple computers are small enough to fit into mobile devices, and can be powered by a small battery. Personal computers in their various forms are icons of the Information Age and are what most people think of as "computers". However, the embedded computers found in many devices from MP3 players to fighter aircraft and from toys to industrial robots are the most numerous.

Artificial intelligence

A computers will solve problems in exactly the way they are programmed to, without regard to efficiency nor alternative solutions nor possible shortcuts nor possible errors in the code. Computer programs which learn and adapt are part of the emerging field of artificial intelligence and machine learning.

Hardware

The term hardware covers all of those parts of a computer that are tangible objects. Circuits, displays, power supplies, cables, keyboards, printers and mice are all hardware.

**History of computing hardware**
First Generation (Mechanical/Electromechanical)	Calculators	Antikythera mechanism, Difference engine, Norden bombsight
First Generation (Mechanical/Electromechanical)	Programmable Devices	Jacquard loom, Analytical engine, Harvard Mark I, Z3
Second Generation (Vacuum Tubes)	Calculators	Atanasoff–Berry Computer, IBM 604, UNIVAC 60, UNIVAC 120
Second Generation (Vacuum Tubes)	Programmable Devices	Colossus, ENIAC, Manchester Small-Scale Experimental Machine, EDSAC, Manchester Mark 1, Ferranti Pegasus, Ferranti Mercury, CSIRAC, EDVAC, UNIVAC I, IBM 701, IBM 702, IBM 650, Z22
Third Generation (Discrete transistors and SSI, MSI, LSI Integrated circuits)	Mainframes	IBM 7090, IBM 7080, IBM System/360, BUNCH
	Minicomputer	PDP-8, PDP-11, IBM System/32, IBM System/36
Fourth Generation (VLSI integrated circuits)	Minicomputer	VAX, IBM System i
	4-bit microcomputer	Intel 4004, Intel 4040
	8-bit microcomputer	Intel 8008, Intel 8080, Motorola 6800, Motorola 6809, MOS Technology 6502, Zilog Z80
	16-bit microcomputer	Intel 8088, Zilog Z8000, WDC 65816/65802
	32-bit microcomputer	Intel 80386, Pentium, Motorola 68000, ARM architecture
	64-bit microcomputer^[33]	Alpha, MIPS, PA-RISC, PowerPC, SPARC, x86-64
	Embedded computer	Intel 8048, Intel 8051
	Personal computer	Desktop computer, Home computer, Laptop computer, Personal digital assistant (PDA), Portable computer,Tablet PC, Wearable computer
Theoretical/experimental	Quantum computer, Chemical computer, DNA computing,Optical computer, Spintronics based computer

**Other Hardware Topics**
Peripheral device (Input/output)	Input	Mouse, Keyboard, Joystick, Image scanner, Webcam, Graphics tablet, Microphone
	Output	Monitor, Printer, Loudspeaker
	Both	Floppy disk drive, Hard disk drive, Optical disc drive, Teleprinter
Computer busses	Short range	RS-232, SCSI, PCI, USB
Computer busses	Long range (Computer networking)	Ethernet, ATM, FDDI

Software

Software refers to parts of the computer which do not have a material form, such as programs, data, protocols, etc. When software is stored in hardware that cannot easily be modified (such as BIOS ROM in anIBM PC compatible), it is sometimes called "firmware" to indicate that it falls into an uncertain area somewhere between hardware and software.

**Computer software**
Operating system	Unix and BSD	UNIX System V, IBM AIX, HP-UX, Solaris (SunOS), IRIX, List of BSD operating systems
	GNU/Linux	List of Linux distributions, Comparison of Linux distributions
	Microsoft Windows	Windows 95, Windows 98, Windows NT, Windows 2000, Windows XP, Windows Vista, Windows 7
	DOS	86-DOS (QDOS), PC-DOS, MS-DOS, DR-DOS, FreeDOS
	Mac OS	Mac OS classic, Mac OS X
	Embedded and real-time	List of embedded operating systems
	Experimental	Amoeba, Oberon/Bluebottle, Plan 9 from Bell Labs
Library	Multimedia	DirectX, OpenGL, OpenAL
Library	Programming library	C standard library, Standard Template Library
Data	Protocol	TCP/IP, Kermit, FTP, HTTP, SMTP
Data	File format	HTML, XML, JPEG, MPEG, PNG
User interface	Graphical user interface(WIMP)	Microsoft Windows, GNOME, KDE, QNX Photon, CDE, GEM, Aqua
User interface	Text-based user interface	Command-line interface, Text user interface
Application	Office suite	Word processing, Desktop publishing, Presentation program, Database management system, Scheduling & Time management, Spreadsheet, Accounting software
	Internet Access	Browser, E-mail client, Web server, Mail transfer agent, Instant messaging
	Design and manufacturing	Computer-aided design, Computer-aided manufacturing, Plant management, Robotic manufacturing, Supply chain management
	Graphics	Raster graphics editor, Vector graphics editor, 3D modeler, Animation editor, 3D computer graphics, Video editing, Image processing
	Audio	Digital audio editor, Audio playback, Mixing, Audio synthesis, Computer music
	Software engineering	Compiler, Assembler, Interpreter, Debugger, Text editor, Integrated development environment, Software performance analysis, Revision control, Software configuration management
	Educational	Edutainment, Educational game, Serious game, Flight simulator
	Games	Strategy, Arcade, Puzzle, Simulation, First-person shooter, Platform, Massively multiplayer, Interactive fiction
	Misc	Artificial intelligence, Antivirus software, Malware scanner, Installer/Package management systems, File manager

Programming languages

The history of computer science began long before the modern discipline of computer science that emerged in the twentieth century, and hinted at in the centuries prior. The progression, from mechanical inventions and mathematical theories towards the modern concepts and machines, formed a major academic field and the basis of a massive worldwide industry.

Birth of computer science

Before the 1920s, computers (sometimes computors) were human clerks that performed computations. They were usually under the lead of a physicist. Many thousands of computers were employed in commerce, government, and research establishments. Most of these computers were women, and they were known to have a degree in calculus. Some performed astronomical calculations for calendars.

After the 1920s, the expression computing machine referred to any machine that performed the work of a human computer, especially those in accordance with effective methods of the Church-Turing thesis. The thesis states that a mathematical method is effective if it could be set out as a list of instructions able to be followed by a human clerk with paper and pencil, for as long as necessary, and without ingenuity or insight.

Machines that computed with continuous values became known as the analog kind. They used machinery that represented continuous numeric quantities, like the angle of a shaft rotation or difference in electrical potential.

Digital machinery, in contrast to analog, were able to render a state of a numeric value and store each individual digit. Digital machinery used difference engines or relays before the invention of faster memory devices.

The phrase computing machine gradually gave away, after the late 1940s, to just computer as the onset of electronic digital machinery became common. These computers were able to perform the calculations that were performed by the previous human clerks.

Since the values stored by digital machines were not bound to physical properties like analog devices, a logical computer, based on digital equipment, was able to do anything that could be described "purely mechanical." The theoretical Turing Machine, created by Alan Turing, is a hypothetical device theorized in order to study the properties of such hardware.

Top Persons in IT TECHNOLOGY

2010-09-04T02:01:00.001-07:00

Top 10 greatest IT people

1. Steve Jobs

2. Tim Berners-Lee

3. Bill Gates

4. James Gosling

5. Linus Torvalds

6. Richard Stallman

7. Arthur C Clark

8. Ted Codd

9. Steve Shirley

10. Martha Lane Fox

1. Steve Jobs: innovator who enjoyed a second bite of the apple

Steve Jobs, the co-founder and chief executive of Apple Computer, topped the Computer Weekly 40th anniversary poll due to the devoted following he has generated through his pioneering work in personal computing and product design.

Jobs was born in 1955 in San Francisco, and during his high school years he showed his early enthusiasm for computing by attending after-school lectures at the Hewlett-Packard Company in Palo Alto, California. He met fellow Apple founder Steve Wozniak during a summer job at HP.

In the autumn of 1974, Jobs, who had dropped out of university after one term, began attending meetings of the Homebrew Computer Club with Steve Wozniak. He took a job as a technician at Atari, a manufacturer of popular video games.

At the age of 21 Jobs saw a computer that Wozniak had designed for his own use and convinced his friend to market the product.

Apple Computer was founded as a partnership on 1 April 1976. Though the initial plan was to sell just printed circuit boards, Jobs and Wozniak ended up creating a batch of completely assembled computers, and entered the personal computer business.

Their second machine, the Apple II, was introduced the following year and became a huge success, turning Apple into an important player in the nascent personal computer industry.

In 1983 Apple launched the Lisa, the first PC with a graphical user interface – an essential element in making computing accessible to the masses. It flopped because of its prohibitive price, but the next year Apple launched the distinct, lower priced Macintosh and it became the first commercially successful GUI machine.

Despite his success in founding Apple, Jobs left following a boardroom row in 1985. But his influence on the computer industry did not end there.

Jobs moved on to found Next Computer, then in 1986 he bought little known The Graphics Group from Lucasfilm, which achieved global dominance in animated feature films during the 1990s, after being renamed Pixar.

Much of Next’s technology had limited commercial success, but it laid the foundation for future computing developments. The company pioneered the object-oriented software development system, Ethernet port connectivity and collaborative software. It was the Next interface builder that allowed Tim Berners-Lee to develop the original world-wide web system at Cern.

Without Jobs, Apple had stumbled. Market share fell while it struggled to release new operating systems. Its answer was to buy Jobs’ company Next, together with its innovative operating system, and welcome back its charismatic former CEO.

On returning to Apple, Jobs drove the company ever deeper into the consumer electronics and computing market, launching the iMac and iPod.

Whether Jobs’ next creation changes the world like the Apple II, or turns out to bomb like the Apple Lisa, his place in computing history is guaranteed.

2. Tim Berners-Lee: father of the web and champion of IT freedom

Dotcoms, bloggers and Google all have one man to thank for their place in the 21st century world. In 1990,
Tim Berners-Lee made the imaginative leap to combine the internet with the hypertext concept, and the worldwide web was born.

Born in 1955 in London, Berners-Lee’s parents were both mathematicians who were employed together on the team that built the Manchester Mark I, one of the earliest computers.

After attending school in London, Berners-Lee went on to study physics at Queen’s College, Oxford, where he built a computer with a soldering iron, TTL gates, an M6800 processor and an old television. While at Oxford, he was caught hacking with a friend and was subsequently banned from using the university computer.
He worked at Plessey Telecommunications from 1976 as a programmer and in 1980 began working as an independent contractor at the European nuclear research centre Cern.

In December 1980, Berners-Lee proposed a project based on the concept of hypertext, to facilitate sharing and updating information among researchers. While there, he built a prototype system called Enquire.

He joined Cern on a full-time basis in 1984 as a fellow. In 1989, Cern was the largest internet node in Europe, and Berners-Lee saw an opportunity. “I just had to take the hypertext idea and connect it to the TCP and DNS ideas,” he said, and the worldwide web was born.

He wrote his initial proposal in March of 1989, and in 1990, with the help of Robert Cailliau, produced a revision which was accepted by his manager, Mike Sendall.

He used similar ideas to those underlying the Enquire system to create the worldwide web, for which he designed and built the first web browser and editor (called World-wide Web and developed on Nextstep) and the first web server called Hypertext Transfer Protocol Daemon (HTTPD).

The first website built was at http://info.cern.ch/ and was put online on 6 August 1991. The URL is still in use today. It provided an explanation of the worldwide web, how one could own a browser and how to set up a web server. It was also the world’s first web directory, since Berners-Lee maintained a list of other websites.

In 1994, Berners-Lee founded the World Wide Web Consortium (W3C) at the Massachusetts Institute of Technology. It comprised various companies willing to create standards and recommendations to improve the quality of the web.

Berners-Lee made his ideas available freely, with no patent and no royalties due. He is now the director of W3C, a senior researcher at MIT’s CSail, and professor of computer science at Southampton University.

3. Bill Gates: mixing maths and money to build microsoft

As joint founder of the world’s biggest software company, Microsoft, Bill Gates’s approach to technology and business was instrumental in making technology available to the masses.

Gates was born in Seattle, Washington in 1955 to a wealthy family: his father was a prominent lawyer and his mother served on the board of directors for First Interstate Bank and The United Way.

At school Gates excelled in mathematics and the sciences and by the age of 13 he was deeply engrossed in software programming.

With other school mates he began programming and bug fixing for the Computer Center Corporation, and in 1970 Gates formed a venture with fellow school student and Microsoft co-founder, Paul Allen, called Traf-O-Data, to make traffic counters using the Intel 8008 processor.

In 1973, Gates enrolled at Harvard University, where he met future business partner Steve Ballmer. Their first venture was to develop a version of the Basic programming language for the Altair 8800, one of the first microcomputers.

Soon afterwards Gates left Harvard to found “Micro-Soft”, which later became Microsoft Corporation, with Allen. Microsoft took off when Gates began licensing his MS-Dos operating systems to manufacturers of IBM PC clones. Its drive to global dominance continued with the development of Windows, its version of the graphical user interface, as an addition to its Dos command line.

By the early 1990s, Windows had driven other Dos-based GUIs like Gem and Geos out of the market. It performed a similar feat with the Office productivity suite.

Gates fought hard to establish Micro soft’s dominant position in the software industry and has fought even harder to defend it. His ability to get Microsoft software pre-installed on most PCs shipped in the world made Microsoft the world’s largest software house and Gates one of the world’s richest men. It also meant Microsoft found itself on the wrong end of anti-trust legislation in both the US and Europe.

Gates stood down as chief executive of Microsoft in 2000 to focus on software development and on 16 June 2006, he announced that he would move to a part-time role with Microsoft in 2008 to focus on his philanthropic work.

Since 2000, Gates has given away about £15.5bn, a third of his wealth, to charity. Such is his fame in the world outside computing,fictional Gates characters have appeared in cartoons including the Simpsons, South Park and Family Guy.

4. James Gosling

Of your choice of the most influential people in IT, James Gosling is the true geek. Unlike Bill Gates and Steve Jobs, neither of whom finished college, Gosling completed a PhD in computer science and contributed to software innovation at a technical level.

Born in 1955 near Calgary, Canada, Gosling is best known as the father of the Java programming language, the first programme language designed with the internet in mind and which could adapt to highly distributed applications.

Gosling received a BSc in computer science from the University of Calgary in 1977, and while working towards his doctorate he created the original version of the Emacs text editor for Unix (Gosmacs). He also built a multi-processor version of Unix, as well as several compilers and mail systems before starting work in the industry.

In 1984, Gosling joined Sun Microsystems, where he is currently chief technology officer in the developer product group.

In the early 1990s, Gosling initiated and led a project code-named Green that eventually became Java. Green aimed to develop software that would run on a variety of computing devices without having to be customised for each one.

Although much of the technology developed as part of Green never saw the light of day, Gosling realised that some of the underlying principles they had created would be very useful in the internet age.

Sun formally launched Java in 1995. Gosling did the original design of Java and implemented its original compiler and virtual machine. For this achievement he was elected to the US National Academy of Engineering. He has also made major contributions to several other software systems, such as Newa and Gosling Emacs.

Although some critics say Java has not lived up to its initial "write-once-run-anywhere" claim, Gosling's success in the Computer Weekly polls is precisely because Java has allowed the creation of robust, reusable code which runs on devices as diverse at mobile phones, PCs and mainframes.

5. Linus Torvalds

As the creator of the Linux operating system, Linus Torvalds has been a driving force behind the whole open source movement, which represents not only an ever increasing challenge to proprietary software, but is also the inspiration for the industry to move to open standards.

Torvalds remains the ultimate authority on what new code is incorporated into the Linux kernel.

6. Richard Stallman

Richard Stallman is the founder of the GNU Project, an initiative to develop a complete Unix-like operating system which is free software. Stallman has written several popular tools, created the GNU licence and campaigns against software patents.

7. Arthur C Clarke

2001: A Space Odyssey writer Arthur C Clarke has consistently been ahead of his time in predicting how technology will change the world. Most notably, in 1945 he suggested that geostationary satellites would make ideal telecoms relays.

8. Ted Codd

Ted Codd created 12 rules on which every relational database is built - an essential ingredient for building business computer systems.

9. Steve Shirley

Steve Shirley was an early champion of women in IT. She founded the company now known as Xansa, pioneered new work practices and in doing so created new opportunities for women in technology.

10. Martha Lane Fox

With Brent Hoberman, Martha Lane Fox created Lastminute.com in 1998, and as "the face" of Lastminute raised the profile of e-commerce ever higher in the public consciousness.

Readers hail Dilbert the guru of corporate culture

According to Computer Weekly readers, Dilbert, which features every week on the back pages of the magazine, has more insight into corporate life and organisation than any number of highly paid management consultants could ever achieve.

Written and drawn by Scott Adams, Dilbert portrays corporate culture as a world of bureaucracy for its own sake, where employees' skills and efforts are not rewarded. Much of the humour emerges from the characters wrestling with the obviously ridiculous decisions and behaviour of management.

1955: a good year for computing

The top four people in our poll were all born in 1955, making it a very beneficial year for the world of computing.

It may have been a good year for computing, but 1955 was a sad year for science, as Albert Einstein died on 18 April.

It was also the year that the first McDonald's fast food franchise was opened: we'll leave you to make up you own mind about that one.

IBM COMPUTERS

2010-09-04T01:48:00.000-07:00

IBM PC compatible computers are those generally similar to the original IBM PC, XT, and AT. Such computers used to be referred to as PC clones, or IBM clones since they almost exactly duplicated all the significant features of the PC architecture, facilitated by various manufacturers' ability to legally reverse engineer the BIOS through clean room design. Columbia Data Products built the first clone of an IBM personal computer through a clean room implementation of its BIOS. Many early IBM PC compatibles used the same computer bus as the original PC and AT models. The IBM AT compatible bus was later named the ISAbus by manufacturers of compatible computers. The term "IBM PC compatible" is now a historical description only since IBM has withdrawn from personal computer sales.

Descendants of the IBM PC compatibles make up the majority of microcomputers on the market today, although interoperability with the bus structure and peripherals of the original PC architecture may be limited or non-existent.

The origins of this platform came with the decision by IBM in 1980 to market a low-cost single-user computer as quickly as possible in response to Apple Computer'ssuccess in the burgeoning market. On 12 August 1981, the first IBM PC went on sale. There were three operating systems (OS) available for it but the most popular and least expensive was PC DOS, a version of MS DOS licensed from Microsoft. In a crucial concession, IBM's agreement allowed Microsoft to sell its own version,MS-DOS, for non-IBM platforms. The only proprietary component of the PC was the BIOS (Basic Input/Output System).

A number of computers of the time based on the 8086 and 8088 processors were manufactured during this period, but with different architecture to the PC, and which ran under their own versions of DOS and CP/M-86. However, software which addressed the hardware directly instead of making standard calls to MS-DOS was faster. This was particularly relevant to games. The IBM PC was sold in high enough volumes to justify writing software specifically for it, and this encouraged other manufacturers to produce machines which could use the same programs, expansion cards and peripherals as the PC. The 808x computer marketplace rapidly excluded all machines which were not functionally very similar to the PC. The 640 kB barrier on "conventional" system memory available to MS-DOS is a legacy of that period; other non-clone machines did not have this limit.

The original "clones" of the IBM Personal Computer were created without IBM's participation or approval. Columbia closely modeled the IBM PC and produced the first "compatible" PC (i.e., more or less compatible to the IBM PC standard) in June 1982 closely followed by Eagle Computer. Compaq Computer Corp. announced its first IBM PC compatible a few months later in November 1982—the Compaq Portable. The Compaq was the first sewing machine-sized portable computer that was essentially 100% PC-compatible. The company could not directly copy the BIOS as a result of the court decision in Apple v. Franklin, but it could reverse-engineer the IBM BIOS and then write its own BIOS using clean room design.

ANALOG COMPUTERS

2010-09-04T01:08:00.000-07:00

An analog computer (spelled analogue in British English) is a form of computer that uses electrical[1], mechanical or hydraulic phenomena to model the problem being solved. More generally an analog computer uses one kind of physical quantity to represent the behavior of another physical system, or mathematical function

A computer that stores data in terms of digits (numbers) and proceeds in discrete steps from one state to the next. The states of a digital computer typically involve binary digits which may take the form of the presence or absence of magnetic markers in a storage medium (see memory), on-off switches or relays. In digital computers, even letters, words and whole texts are represented digitally. Unlike analog computers, digital computers can only approximate a continuum by assigning large numbers of digits to a state description and by proceeding in arbitrarily small steps

Hybrid computers are computers that comprise features of analog computers and digital computers. The digital component normally serves as the controller and provides logical operations, while the analog component normally serves as a solver of differential equations.

1. IBM PC
2. IBM Compatible
3. Apple/Macintosh

1. IBM PC
IBM stands for International Business Machine. IBM PC stand for International Business Personal Computer. IBM is one of the largest computer and other electronic equipment manufacture company in the world established in USA in 1924. They sells mainframe, mini and micro computers. These computers are called IBM computers. The computer produced by the company are reliable, durable and have high processing machine.

2. IBM Compatible
Many companies make clones of IBM's personal computer which are often called compatible. IBM compatible can use hardware and software designed for the IBM PC. The internal architecture of IBM compatible is similar to IBM PC. They are also called duplicate computer to IBM PC. Eg. EPSON, ACER,etc.

3. Apple/Macintosh
Apple Macintosh Company is one of the largest personal computer manufacturer located in Coupetino, California established by stove jobs and Steve Woznials on first April 1976. The internal architecture of these computers are totally different from that of IBM. They have their own software. Apple Macintosh were among the first mirco produced by this company. Later on, Apple Computer manufactured a new brand of Computer popularly known as Macintosh in 1984. Macintosh become notable for popularising the GUI (Graphical User Interface). The operating system produced by Apple Company for their Macintosh is called MAC OS. Most of the Desktop publishing houses in Nepal use these computer.