Laptop

History

The first laptop was created by Adam Osborne in 1981, in the USA. and its first portable model was called Osborne I.

The model opposite, going back to 1982, weighs approximately 11 kg and offers a RAM of 64 KB under system CP/M 8 bits.

Delivered without hard drive, it is equipped with two flexible disk drives of format 5" 1/4 of a capacity of less than 80 KB formatted and of a screen of 5" (posting in green on black bottom). Its obstruction had been studied to place it under the momentary seat on the aircraft to avoid the baggage hold to him. It was provided with a whole of standard office automation programs for a use in a professional framework. It could be equipped with a battery of 12 volts making it more autonomous.

Its competitor will be then the Kaypro much more rustic in its form making it resemble a machine of industrial laboratory, but, him, will be equipped with a screen of 9" , readers of greater capacity and often (innovation) of an hard drive.

In the years 1980, one makes a distinction between portable computer and portable . Portable meant that one was to connect the machine with a socket-outlet to make use of it, whereas transportable meant that the machine is also equipped with a battery and thus could be used anywhere. With the 21e century one uses the “portable” term to indicate in fact a “transportable”.

General principles

They must comprise:

central processing unit with mother chart, read-only memory, random access memory;
disk drive (less and less delivered as from the years 2000);
hard drive since several years;
flat panel display (the first were equipped with tube CRT of low diagonal dimension);
keyboard (reduced, without distinct numeric keypad);
various standard connectors to supplement their equipment outside;
shelf (touchpad) replacing the mouse and its buttons.

The laptops are more expensive than the desktop machines (because of the miniaturization and the lack of mass production of the components), and are slower (because it is necessary to avoid releasing too much heat and avoiding consuming too much energy for better a autonomy).

To answer these the last two requirements, they are equipped with a “attached” Processeur and with a Hard drive of compactness (in 2007 2" ½).

Processors especially studied to manage the consumption of energy to just are often used.

There exist derivative products:

Ultraportables : much lighter, even smaller, but more expensive too;
Transportable : heavier, about 5 to 7 kg, they embark more powerful components like an hard drive 3" ½, a graphics card 3D and a broader screen;
Tablet PC (or shelves);
Livrel .

Examples before standardization

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