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Laptops 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. Many 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: 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. Some parts for a modern laptop have no corresponding part in a desktop computer: * Sony - VAIO * Notebooks weighing around 5 kg are sometimes termed desknotes (desktop/notebook). * Portable computer * Desktop computer

* Improved hard disk technology. Early laptops had only floppy disk drives. 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. Laptops usually run on batteries, but also from adapters which also charge the battery using mains electricity. 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. It is sometimes preferable to use a laptop on a desk. * Relion Similarly it is often possible to wirelessly connect a laptop using a cellphone as a modem. Infra-red, USB and Bluetooth solutions are available. The same caveats regarding price of service apply. * Improved battery technology. 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. 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. * Toshiba - Dynabook, Equium, Portege, Tecra, Satellite, Qosmio, Libretto

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* Gateway 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. 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. 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. 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.

* Tablet PC * Sony - VAIO * 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.