LaptopLaptop with touchpad. An older (1997) Micron laptop. A modern mid-range HP Laptop. Being large and powerful, with average battery life, it is best used as a desktop replacementA laptop computer (also known as notebook computer) is a small mobile personal computer, usually weighing from 1 to 3 kilograms (2 to 7 pounds). Terms for subtypes of notebooks (and related computer types) include:
Laptops usually run on batteries, but also from adapters which also charge the battery using mains electricity. Laptops are capable of many of the same tasks that desktop computers perform, although they are typically less powerful for the same price. Laptops contain components that are similar to those in their desktop counterparts and perform the same functions but are miniaturized and optimized for mobile use and efficient power consumption. Laptops usually have liquid crystal displays and use SO-DIMM (Small Outline DIMM) modules (rather than the larger DIMMs used in desktop computers) for their RAM. In addition to a built-in keyboard, they may utilize a touchpad (also known as a trackpad) or a pointing stick for input, though an external mouse or keyboard can usually be attached. HistoryThe Macintosh Portable, Apple's first attempt at a laptop.Before laptop computers were technically feasible, similar ideas had been proposed, most notably Alan Kay's Dynabook concept, developed at Xerox PARC in the early 1970s. The first commercially available portable computer was the Osborne 1 in 1981, which used the CP/M operating system. Although it was large and heavy compared to today's laptops, with a tiny CRT monitor, it had a near-revolutionary impact on business, as professionals were able to take their computer and data with them for the first time. This and other "luggables" were inspired by what was probably the first portable computer, the Xerox NoteTaker, developed at Xerox PARC in 1976; however, only ten prototypes were built. The Osborne was about the size of a portable sewing machine, and importantly could be carried on a commercial aircraft. However, it was not possible to run the Osborne on batteries; it had to be plugged in. A more enduring success was the Compaq Portable, the first product from Compaq, introduced in 1983, by which time the IBM Personal Computer had become the standard platform. Although scarcely more portable than the Osborne machines, and also requiring AC power to run, it ran MS-DOS and was the first true IBM clone. (IBM's own later Portable Computer, which arrived in 1984, was notably less IBM-compatible than the Compaq.) Another claim to be the "first laptop" was made by a novice programmer Thomas Kelly in 1982. While it was made to be used upon one's lap, it weighed 150 pounds, and therefore could not be deemed truly portable. However, arguably the first true laptop was the GRiD Compass 1101, designed by Bill Moggridge in 1979, and released in 1982. Enclosed in a magnesium case, it introduced the now familiar clamshell design, in which the flat display folded shut against the keyboard. The computer could be run from batteries, and was equipped with a 320×200-pixel plasma display and 384-kilobyte bubble memory. It was not IBM-compatible, and its high price (US$ 10,000) meant that it was limited to specialized applications. However, it was used heavily by the U.S. military, and was used on the Space Shuttle during the 1980s. The GRiD company subsequently earned significant returns on its patent rights as its innovations became commonplace. GRiD Systems Corp was later bought by Tandy (RadioShack). Two other noteworthy early laptops were the Sharp PC-5000 (1983) and the Gavilan SC, announced in 1983 but first sold in 1984. The Gavilan was notably the first computer to be marketed as a "laptop." It was also equipped with a pioneering touchpad-like pointing device, installed on a panel above the keyboard. Like the GriD Compass, the Gavilan and the Sharp were housed in clamshell cases, but they were partly IBM-compatible, although primarily running their own system software. Both had LCD displays, and had optional printers that attached to their cases. 1983 also saw the launch of what was probably the biggest-selling early laptop, the Kyocera Kyotronic 85. Although it was at first a slow seller in Japan, it was quickly licensed by Tandy Corporation, Olivetti, and NEC, who saw its potential and marketed it as the Olivetti M-10, NEC PC-8201, and [1] Radio Shack TRS-80_Model_100_line or Tandy 100. The machines ran on standard AA batteries. The Tandy's internal programs, including a BASIC interpreter, a text editor, and a terminal program, were supplied by Microsoft, and are thought to have been written in part by Bill Gates himself. The computer was not a clamshell, but provided a tiltable 8×40-character LCD screen above a full-travel keyboard. With its internal modem, it was a highly portable communications terminal. Due to its portability, good battery life (and ease of replacement), reliability (it had no moving parts), and low price (as little as US $300), the model was highly regarded, becoming a favorite among journalists. It weighed less than 2 kg (4 lb) with dimensions of 30 x 21.5 x 4.5 cm (12 x 8.5 x 1.75 inches). Initial specs included 8 kb of RAM (expandable to 24 kb) and a 3 MHz processor. Among the first commercial IBM-compatible laptops were the IBM PC Convertible, introduced 1986, and the Toshiba T1000 and T1200, introduced 1987. Although limited floppy-based DOS machines (the operating system was stored in ROM), the Toshiba machines were small and light enough to be carried in a backpack, and could be run off lead-acid batteries. These also introduced the now-standard "resume" feature to DOS-based machines; the computer could be paused between sessions, without having to be restarted each time. Another notable computer was the Cambridge Z88, designed by Clive Sinclair, introduced in 1988. About the size of an A4 sheet of paper, it ran on standard batteries, and contained basic spreadsheet, word processing, and communications programs. Although it anticipated the future miniaturization of the portable computer, as a ROM-based machine with a small display it can — like the TRS-80 Model 100 — also be seen as a foreruner of the PDA. By the end of the 1980s, laptop computers were becoming popular among business people. The NEC Ultralite, released in mid-1989, was perhaps the first notebook computer, weighing just over 2 kg; in lieu of a floppy or hard drive, it contained a 2-megabyte RAM drive, but this reduced its utility as well as its size. The first notebook computers with standard drives were the Compaq LTE series, introduced toward the end of that year. Truly the size of a notebook, they had hard drives and standard-resolution screens. The first Apple Computer machine designed to be used on the go was the 1989 Macintosh Portable (although an LCD screen had been an option for the transportable Apple IIc in 1984). Another "luggable," rather than laptop, the Mac Portable was praised for its clear active matrix display and long battery life, but was a poor seller due to its bulk. In the absence of a true Apple laptop, several compatible machines such as the Outbound Laptop were available for Mac users; however, for copyright reasons, the user had to supply a set of Mac ROMs, which usually meant having to buy a new or used Macintosh as well. The Apple PowerBook series, introduced in 1991, heralded many changes that are now standard on laptops, including ergonomic improvements such as the placement of the keyboard at the back of the machine, thus creating a palm rest, and the inclusion of a built-in pointing device (a trackball). The following year, IBM released its Thinkpad series, offering similar miniaturization. Later PowerBooks introduced the first 256-color displays, first true touchpad, and first built-in Ethernet networking. As technology improved during the 1990s, the usefulness and popularity of laptops increased while prices went down. Several developments specific to laptops were quickly implemented in their design, improving their usability and performance compared to desktop computers. Among them were:
In 2005, faculty members from the MIT Media Lab including Nicholas Negroponte introduced the $100 laptop as part of the One Laptop Per Child project. The aim is to design, manufacture, and distribute laptops that are sufficiently inexpensive to provide every child in the world access to knowledge and modern forms of education. The laptops will be sold to governments and issued to children by schools on a basis of one laptop per child. These machines will be rugged, Linux-based, and so energy efficient that hand-cranking alone will generate sufficient power for operation. Ad-hoc wireless mesh networking may be used to allow many machines Internet access from one connection. The pricing goal is to start at $100 and then steadily decrease. PartsMany parts for a laptop computer are smaller, lighter, or otherwise adapted from the corresponding part in a desktop computer:
Some parts for a modern laptop have no corresponding part in a desktop computer:
UpgradabilityLaptops generally cost more than a desktop computer of similar specification. Performance is usually lower than that of a comparable desktop because of the compromises necessary to keep weight and power consumption low. Upgradability is severely limited: typically only the RAM and hard drive can be upgraded. Often the CPU can also be replaced, and sometimes video card modules are upgradable too. Many laptops also include a MiniPCI slot inside, however it is usually not intended to be utilized by the end user. Because nearly all functions are integrated into the proprietary-design mainboard theoretically to save space and power, laptops are difficult to repair and upgrade. Outright replacement of faulty parts can include the display screen, drives, daughterboards, modem, storage devices and other components, but repair costs can be high, even when feasible (low upgradability). There is not a standard for A4-size laptops. PerformanceLaptop performance has been inferior to desktops for the same price. Desktops have outperformed mobile computers because new technologies expend more heat. These new technologies take time to tranfer over to the laptop market because of its smaller package. While desktops continue to outperform notebooks at the high end, both types of systems generally offer sufficient performance for the mainstream. This still existent difference in performance continues to be minimized. Misconceptions about laptopsDespite their name, using a laptop on one's lap can be both unpleasant (due to heat from the computer, particularly from its CPU) and possibly even dangerous to the laptop, as it may overheat. It is sometimes preferable to use a laptop on a desk. The word laptop is often spelled incorrectly as "labtop," "lab top," or "lap top." Some computer novices assume that laptops are constantly connected to the Internet, even (for example) while located on moving vehicles. This is a myth perpetuated by many commercials, where a person is shown using the company's website from a laptop with no wires plugged into it. This is possible via Wi-Fi or related technologies, but most laptops do not maintain a constant connection to the Internet. The growth of Metropolitan area networks may render a constant connection possible in the future. However, most modern mid-range laptops have integrated WiFi, so only require a wireless router to connect to the internet; or a wireless hotspot. Laptops & laptop brands
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However, most modern mid-range laptops have integrated WiFi, so only require a wireless router to connect to the internet; or a wireless hotspot. Parallels include:. The growth of Metropolitan area networks may render a constant connection possible in the future. Original series producer Glen Larson is a member of this church. This is possible via Wi-Fi or related technologies, but most laptops do not maintain a constant connection to the Internet. Less apparent are references to the theology of the Church of Jesus Christ of Latter-Day Saints (more commonly known as the Mormon church). This is a myth perpetuated by many commercials, where a person is shown using the company's website from a laptop with no wires plugged into it. If the universe began then, the 21st century would have marked the seventh millennium. Some computer novices assume that laptops are constantly connected to the Internet, even (for example) while located on moving vehicles. In the 1978 pilot episode, the president of the Colonies referenced that they were "approaching the seventh millennium of time." Some Bible scholars assert the seven days of creation described in the Book of Genesis occurred in the fourth millennium B.C. The word laptop is often spelled incorrectly as "labtop," "lab top," or "lap top.". He tries to convince members of the colonial fleet to follow him, as demons do in Christianity and Islam. It is sometimes preferable to use a laptop on a desk. The character Count Iblis in the 1978 series was inspired by the demon Iblis in Islamic mythology. Despite their name, using a laptop on one's lap can be both unpleasant (due to heat from the computer, particularly from its CPU) and possibly even dangerous to the laptop, as it may overheat. The word "Adama" in Hebrew means "Earth.". This still existent difference in performance continues to be minimized. Several of the characters in the series have names corresponding to significant characters in Greek mythology, including Apollo and Cassiopeia. While desktops continue to outperform notebooks at the high end, both types of systems generally offer sufficient performance for the mainstream. The twelve colonies are named after the astrological signs of the Greek zodiac; for example, Scorpia (Scorpio), Caprica (Capricornus), and Aquaria (Aquarius). These new technologies take time to tranfer over to the laptop market because of its smaller package. A Battlestar Galactica video game has been published on the Sony PlayStation 2 and Microsoft Xbox platforms. Desktops have outperformed mobile computers because new technologies expend more heat. Marvel Comics published a short-lived comic book series based upon the show between 1978 and 1981. Laptop performance has been inferior to desktops for the same price. In the 1990s, original series star Richard Hatch co-wrote several new novels based upon the series as part of his efforts to spark a revival. There is not a standard for A4-size laptops. A number of Battlestar novels based upon the series have been published over the years, including a mixture of novelizations based upon televised episodes (including the pilot episodes of both the original series and Galactica 1980) and original stories. Outright replacement of faulty parts can include the display screen, drives, daughterboards, modem, storage devices and other components, but repair costs can be high, even when feasible (low upgradability). As of January 2006, the second half of the second season began broadcasting in the United States, while the full season premiere ('Scattered') aired on Sky One in the UK on 10th January 2006. Because nearly all functions are integrated into the proprietary-design mainboard theoretically to save space and power, laptops are difficult to repair and upgrade. The sampler strategy was similar to past efforts at NBC to assist other cable siblings' shows, such as a counter-programming block of Queer Eye for the Straight Guy opposite the Super Bowl airing on a competing broadcast network. Many laptops also include a MiniPCI slot inside, however it is usually not intended to be utilized by the end user. NBC additionally aired three selected first season episodes as a sampler to entice new American viewers in advance of the second season premiere in July 2005. Often the CPU can also be replaced, and sometimes video card modules are upgradable too. Sci Fi Channel — on January 9, 2005, five days before the American debut of the series. Upgradability is severely limited: typically only the RAM and hard drive can be upgraded. A highly edited version of the miniseries aired on NBC — a corporate sibling of the U.S. Performance is usually lower than that of a comparable desktop because of the compromises necessary to keep weight and power consumption low. Featuring critically acclaimed, veteran actors in Edward James Olmos and Mary McDonnell, the new series began in earnest in October 2004 in the UK, and January 2005 in North America. Laptops generally cost more than a desktop computer of similar specification. This miniseries was so successful that Sci-Fi opted to develop this new, reimagined version of Galactica into a television series. Some parts for a modern laptop have no corresponding part in a desktop computer:. In December 2003, the American Sci Fi channel broadcast a four-hour miniseries that reimagined Battlestar Galactica. Many parts for a laptop computer are smaller, lighter, or otherwise adapted from the corresponding part in a desktop computer:. A weekly new Galactica series on Sci-Fi followed in January 2005. The pricing goal is to start at $100 and then steadily decrease. Edward James Olmos stepped into the role of Commander Adama. Ad-hoc wireless mesh networking may be used to allow many machines Internet access from one connection. Moore as the creative force behind it. These machines will be rugged, Linux-based, and so energy efficient that hand-cranking alone will generate sufficient power for operation. Despite attempts to revive the series over the years, none came to fruition until it was reimagined in 2003 by the Sci-Fi Channel with Ronald D. The laptops will be sold to governments and issued to children by schools on a basis of one laptop per child. This video, titled "Battlestar Galactica: The Second Coming," was displayed at science fiction conventions but did not lead to a new series. The aim is to design, manufacture, and distribute laptops that are sufficiently inexpensive to provide every child in the world access to knowledge and modern forms of education. Hatch even went so far as to produce a demonstration video in the mid-1990s which featured several actors from the original series combined with state-of-the-art special effects. In 2005, faculty members from the MIT Media Lab including Nicholas Negroponte introduced the $100 laptop as part of the One Laptop Per Child project. The original series maintained a cult fandom, which has supported efforts by Glen Larson and Richard Hatch (independent of each other) to revive the premise. Among them were:. Some syndication packages for Battlestar Galactica incorporate the episodes of this series. Several developments specific to laptops were quickly implemented in their design, improving their usability and performance compared to desktop computers. The show also included obviously recycled space battle sequences from the original program, to the great dismay of fans. As technology improved during the 1990s, the usefulness and popularity of laptops increased while prices went down. This series was a quick failure due to its low budget, widely-panned writing, and ill-placed time slot (Sundays at 7:00 PM, a time slot generally reserved for family-oriented programming and, more specifically, 60 Minutes). Later PowerBooks introduced the first 256-color displays, first true touchpad, and first built-in Ethernet networking. In this 1980 sequel series, the fleet finds Earth and covertly protects it from the Cylons. The following year, IBM released its Thinkpad series, offering similar miniaturization. Despite the early success of the premiere, the weekly series failed to deliver and Galactica 1980 was unceremoniously cancelled after only ten episodes. The Apple PowerBook series, introduced in 1991, heralded many changes that are now standard on laptops, including ergonomic improvements such as the placement of the keyboard at the back of the machine, thus creating a palm rest, and the inclusion of a built-in pointing device (a trackball). Again, it was decided this new version of Galactica would be made into a weekly series. In the absence of a true Apple laptop, several compatible machines such as the Outbound Laptop were available for Mac users; however, for copyright reasons, the user had to supply a set of Mac ROMs, which usually meant having to buy a new or used Macintosh as well. A new television movie entitled Galactica 1980 was rushed into production. Another "luggable," rather than laptop, the Mac Portable was praised for its clear active matrix display and long battery life, but was a poor seller due to its bulk. A suitable concept would be needed to draw viewers, and it was decided that the arrival of the Colonial Fleet at contemporary Earth would be the storyline. The first Apple Computer machine designed to be used on the go was the 1989 Macintosh Portable (although an LCD screen had been an option for the transportable Apple IIc in 1984). Larson to consider a relaunch of the series. Truly the size of a notebook, they had hard drives and standard-resolution screens. During the autumn of 1979, ABC executives met with Galactica's creator Glen A. The first notebook computers with standard drives were the Compaq LTE series, introduced toward the end of that year. Citing declining ratings and cost overruns, ABC cancelled Battlestar Galactica in April, its last episode "The Hand of God" premiering on April 29, 1979. The NEC Ultralite, released in mid-1989, was perhaps the first notebook computer, weighing just over 2 kg; in lieu of a floppy or hard drive, it contained a 2-megabyte RAM drive, but this reduced its utility as well as its size. During the eight months after the three-hour pilot episode aired, 17 original episodes of the series were aired (five of them two-parters), totaling 25 hours of broadcasting. By the end of the 1980s, laptop computers were becoming popular among business people. It was first broadcast on ABC on September 17, 1978. Although it anticipated the future miniaturization of the portable computer, as a ROM-based machine with a small display it can — like the TRS-80 Model 100 — also be seen as a foreruner of the PDA. Opening on July 7, 1978, the theatrical release did quite well given modest expectations. About the size of an A4 sheet of paper, it ran on standard batteries, and contained basic spreadsheet, word processing, and communications programs. To defray costs, the pilot was recut as a theatrical release which played in Canada, Europe and Japan. Another notable computer was the Cambridge Z88, designed by Clive Sinclair, introduced in 1988. The three-hour-long pilot episode starred Lorne Greene, Richard Hatch and Dirk Benedict. These also introduced the now-standard "resume" feature to DOS-based machines; the computer could be paused between sessions, without having to be restarted each time. The three-hour pilot was released in theaters, and instead of two additional movies, a weekly television series followed. Although limited floppy-based DOS machines (the operating system was stored in ROM), the Toshiba machines were small and light enough to be carried in a backpack, and could be run off lead-acid batteries. Initially, Battlestar Galactica was envisioned by Larson as a series of made-for-TV movies (a three-hour pilot and two two-hour episodes) for the ABC television network. Among the first commercial IBM-compatible laptops were the IBM PC Convertible, introduced 1986, and the Toshiba T1000 and T1200, introduced 1987. The lawsuit was eventually dismissed in 1980. Initial specs included 8 kb of RAM (expandable to 24 kb) and a 3 MHz processor. Universal promptly countersued, claiming Star Wars had stolen ideas from the 1972 film Silent Running (notably the robot "drones") and the Buck Rogers serials of the 1940s. It weighed less than 2 kg (4 lb) with dimensions of 30 x 21.5 x 4.5 cm (12 x 8.5 x 1.75 inches). In fact, 20th Century Fox sued Universal Studios (the studio behind Battlestar Galactica) for plagiarism, claiming that it had stolen 34 distinct ideas from Star Wars. Due to its portability, good battery life (and ease of replacement), reliability (it had no moving parts), and low price (as little as US $300), the model was highly regarded, becoming a favorite among journalists. Battlestar Galactica was finally produced in the wake of the success of the 1977 film Star Wars Episode IV: A New Hope. With its internal modem, it was a highly portable communications terminal. Larson, the Executive Producer of Battlestar Galactica, has stated in interviews that he originally conceived of the Galactica premise in the late 1960's, which he originally called Adam's Ark. However, he was unable to get the project greenlit for many years. The computer was not a clamshell, but provided a tiltable 8×40-character LCD screen above a full-travel keyboard. Glen A. The Tandy's internal programs, including a BASIC interpreter, a text editor, and a terminal program, were supplied by Microsoft, and are thought to have been written in part by Bill Gates himself. . The machines ran on standard AA batteries. The title is sometimes formatted with a colon as Battlestar: Galactica, but it is more commonly seen without. Although it was at first a slow seller in Japan, it was quickly licensed by Tandy Corporation, Olivetti, and NEC, who saw its potential and marketed it as the Olivetti M-10, NEC PC-8201, and [1] Radio Shack TRS-80_Model_100_line or Tandy 100. Under the leadership of the famed military leader Commander Adama, the Battlestar Galactica and her crew take up the task of leading the "ragtag fleet" of survivors into space in search of a fabled refuge known as Earth. 1983 also saw the launch of what was probably the biggest-selling early laptop, the Kyocera Kyotronic 85. Of all the Colonial Fleet, the Battlestar Galactica appears to be the only ship which survived the attack. Both had LCD displays, and had optional printers that attached to their cases. The last few thousands of human survivors flee into space aboard any spacecraft they can reach. Like the GriD Compass, the Gavilan and the Sharp were housed in clamshell cases, but they were partly IBM-compatible, although primarily running their own system software. The Colonies have long been at peace with a cybernetic race known as the Cylons, but with the cooperation of a human collaborator named Baltar, the Cylons launch a sudden, coordinated, and unprovoked attack on the Colonies, laying waste to the planets and devastating their populations. The Gavilan was notably the first computer to be marketed as a "laptop." It was also equipped with a pioneering touchpad-like pointing device, installed on a panel above the keyboard. In a distant part of the galaxy, there exists a civilization of humans who live on planets known as the Twelve Colonies. Two other noteworthy early laptops were the Sharp PC-5000 (1983) and the Gavilan SC, announced in 1983 but first sold in 1984. All of the Battlestar Galactica productions share the same general premise. GRiD Systems Corp was later bought by Tandy (RadioShack). There are also a series of book adaptations, original novels, comic books, and video games that have been based on the concept. The GRiD company subsequently earned significant returns on its patent rights as its innovations became commonplace. Battlestar Galactica is a franchise of American science fiction films and television series, the first of which was produced in 1978. military, and was used on the Space Shuttle during the 1980s. In Mormon theology, the star closest to the Throne of God is called Kolob. However, it was used heavily by the U.S. The system which is believed to be the original home of the human race is Kobol. It was not IBM-compatible, and its high price (US$ 10,000) meant that it was limited to specialized applications. The beings on the Ship of Light say, "as you are, we once were; as we are, you may one day be", a parallel to the Mormon belief that even God was once a human being. The computer could be run from batteries, and was equipped with a 320×200-pixel plasma display and 384-kilobyte bubble memory. Marriages in the Battlestar Galactica mythos as well as in the Mormon religion are sealed for eternity. Enclosed in a magnesium case, it introduced the now familiar clamshell design, in which the flat display folded shut against the keyboard. A president who is assisted by two counselors and a Quorum of the Twelve Apostles preside over the Mormon Church. However, arguably the first true laptop was the GRiD Compass 1101, designed by Bill Moggridge in 1979, and released in 1982. A Council of Twelve, headed by a president, governs the colonies. While it was made to be used upon one's lap, it weighed 150 pounds, and therefore could not be deemed truly portable. In The Book of Mormon is the teaching that during the reign of king Zedekiah (about 600 BC), two separate groups left Jerusalem and ended up in the Americas; a remnant (or 'thirteenth tribe') of the twelve tribes of Israel. Another claim to be the "first laptop" was made by a novice programmer Thomas Kelly in 1982. Therefore, when Moses led them from Egypt back to their promised land, they are divided into thirteen tribes for purposes of inheritance. (IBM's own later Portable Computer, which arrived in 1984, was notably less IBM-compatible than the Compaq.). As Israel's favorite son, Joseph received a double inheritance. Although scarcely more portable than the Osborne machines, and also requiring AC power to run, it ran MS-DOS and was the first true IBM clone. In the Old Testament, Israel had twelve sons. A more enduring success was the Compaq Portable, the first product from Compaq, introduced in 1983, by which time the IBM Personal Computer had become the standard platform. But there are some parallels that may have inspired this 'Thirteenth Tribe' idea:
This and other "luggables" were inspired by what was probably the first portable computer, the Xerox NoteTaker, developed at Xerox PARC in 1976; however, only ten prototypes were built. The race of humanity is led by Commander Adama, whose name bears similarity to that of Adam, the first human. Although it was large and heavy compared to today's laptops, with a tiny CRT monitor, it had a near-revolutionary impact on business, as professionals were able to take their computer and data with them for the first time. The first commercially available portable computer was the Osborne 1 in 1981, which used the CP/M operating system. Before laptop computers were technically feasible, similar ideas had been proposed, most notably Alan Kay's Dynabook concept, developed at Xerox PARC in the early 1970s. . In addition to a built-in keyboard, they may utilize a touchpad (also known as a trackpad) or a pointing stick for input, though an external mouse or keyboard can usually be attached. Laptops usually have liquid crystal displays and use SO-DIMM (Small Outline DIMM) modules (rather than the larger DIMMs used in desktop computers) for their RAM. Laptops contain components that are similar to those in their desktop counterparts and perform the same functions but are miniaturized and optimized for mobile use and efficient power consumption. Laptops are capable of many of the same tasks that desktop computers perform, although they are typically less powerful for the same price. Laptops usually run on batteries, but also from adapters which also charge the battery using mains electricity. Terms for subtypes of notebooks (and related computer types) include:. A laptop computer (also known as notebook computer) is a small mobile personal computer, usually weighing from 1 to 3 kilograms (2 to 7 pounds). Zyrex. Winbook. Voodoo PC - Envy. Rock Direct. Relion. Toshiba - Dynabook, Portege, Tecra, Satellite, Qosmio, Libretto. Tadpole - SPARCbook. Sager - NP series. Sony - VAIO. Samsung - Sens. Panasonic - Toughbook. Packard Bell - EasyNote. NEC - VERSA. Medion. Linuxcertified - Linux laptop. LG - XNOTE. Lenovo - IBM ThinkPad. iQon - Qompanion. Hypersonic. Hewlett Packard - HP Pavilion and HP Omnibook. Gericom. Gateway. Fujitsu Siemens - Lifebook. ECS. Dell - Inspiron and Latitude. Compaq - EVO, Armada, LTE, and Presario. Clevo. Bacoc. Averatec. ASUS. Apple Computer - iBook, PowerBook and MacBook Pro. Alienware - Area 51m, Sentia and Aurora m series. Acer - TravelMate and Aspire. These devices weigh about 500 g (about 1 lb) and often take the name "power brick.". Most laptops are powered or recharged from an external AC converter that usually takes the form of a plain black rectangular box. Docking stations may be used for expanding connectors and quickly connecting many components to the laptop, although they are falling out of favour as laptops' integral capabilities increase and USB allows several peripherals to be connected through one plug. Batteries gradually degrade over time and eventually need to be replaced, depending on the charging and discharging pattern, from one to five years. Typical battery life for most laptops is two to five hours with light-duty use, but may drop to as little as one hour with intensive use. Current models use lithium ion batteries, which have largely replaced the older nickel metal-hydride technology. At one point, the Pismo G3, at up to 500 MHz, was faster than the fastest desktop G3 (then the B&W G3), which ran at 450 MHz. However, the PowerPC G3 and G4 processor generations have been able to offer almost the same performance as their desktop versions, limited mostly by lower performance in other parts of the system bus bandwidth and peripheral units) in Apple's notebooks; recently, though, with the introduction of the G5s, they have been far outstripped. Generally, notebook processors are less powerful than their desktop counterparts, owing to the need to conserve electricity and reduce heat output. Motorola and IBM develop and manufacture the PowerPC chips for Apple notebooks. Notebook processor: There are a wide range of notebook processors available from Intel (Pentium M (with Centrino technology), Celeron, Intel Core Duo and Centrino Duo) and from AMD (Athlon, Turion 64, and Sempron). Modern laptops can often handle sophisticated games, but tend to be limited by their fixed screen resolution and display adapter type. Display adapters and sound cards are integrated. Internal hard disks are smaller—2.5 inch (64 mm) compared to the standard desktop 3.5 inch (90 mm) drive—and usually have lower performance and power consumption. Most modern laptops use an active matrix display with resolutions of 1024 by 768 pixels (XGA) and above, screen sizes 10 inch (250 mm) or larger, and have a PC-Card expansion bay for expansion cards, formerly called PCMCIA. Internal modems and standard serial, parallel, and PS/2 ports on IBM PC-compatible laptops made it easier to work away from home; the addition of Ethernet networking ports and, from 1997, USB, and from 1999, Wi-Fi, made laptops as easy to use with peripherals as a desktop computer. Improved interconnectivity. As thin, high-capacity hard disk drives with higher reliability and shock resistance and lower power consumption became available, users could store their work on laptop computers and take it with them. Early laptops had only floppy disk drives. Improved hard disk technology. Improvements in production technology meant displays became larger, sharper, had higher display resolution, and could display color with great accuracy, making them an acceptable substitute for a traditional CRT monitor. Early laptop screens were black and white or grayscale passive-matrix LCD displays prone to heavy shadows and blurry movement (some portable computer screens were sharper monochrome plasma displays, but these drew too much current to be powered by batteries). Improved liquid crystal display design, in particular active-matrix display technology, and increasingly, color screens. While laptops in 1991 were limited to the slower 80286 processor because of the energy demands of the more powerful 80386, the introduction of the Intel 386SX processor, designed for the specific power needs of laptops, marked the point at which laptop needs were included in processor design. Power-saving processors. The heavy lead-acid batteries were replaced with lighter and more efficient technologies, first nickel metal hydride (NiMH) and then lithium ion and lithium polymer. Improved battery technology. Computers larger than PDAs but smaller than notebooks are also sometimes a called palmtops. Powerful laptops (often heavy) designed to compete with the computing power offered by a typical desktop are sometimes known as desktop replacements. Notebooks weighing around 5 kg are sometimes termed desknotes (desktop/notebook). Notebooks smaller than a A4 sheet of paper and weighing around 1 kg are sometimes called sub-notebooks or subnotebooks. |