Computers have a different sizes and weight.Long time ago computers first invented have a giant sizes.When time passed by,man found another way of the invention of computers.It is for a new generations of small computers.Today's computers was place in in table or it is call desktop.It is smaller than the first computers that our room is fill because of such computers.
It followed by luggables or transportables as a small case that we can bring it anywhere.Its weight 15lbs and above,many of them works on from electric power.Laptops came us until now it was very popular in today's life.It's smaller and have 8lbs to 15lbs.We call it laptop because it was place in our thigh powered by battery's life.
Notebooks followed too, as an ordinary notebooks size.It has 7 lbs to 8 lbs or light of it.There was smaller than notebook called subnotebook,its weight 5lbs below.Both of them rans through electric power and battery.The smallest kind is called palmtop it has 2lbs and below.It place to your hand and you can hide it also in your pockets.PDA Personal Digital Assistants( as newton made of Apple )is like a palmtop.It was use by stylus or pen to write it on the screen it seems calculator.
Laptops and notebooks has a different types of screen.It may monochrome,Liquid crystal display ( LCD )and a gas plasma display.MOnochrome have only one color.In other side many color of screen is used of LCD.Principles of LCD is like the principles of ordinary calculator screens which below of the screen dissolve crystal or chemical liquid found in between of two electrode.If you use power from wire the liquid wil shine or dark.In this way you can make letters or graphics in the screen.The third type is called gas plasma display,it is like LCD but it is gas ( as neon) instead crystal.Many microproccesor of small computers is like also in desktop like for example 486 and 386 sx.
But in 1991 the Intel made 386 SL an execellent and it will be nice to use because of automatic off switch.RAM Random Access Memory the bank of information.The bigger RAM is the more information you can place.The smallest information you can place in the RAM called byte.One thousand bytes is equal to one kilobyte (KB).One million bytes called one megabyte (KB).One million bytes called megabytes (MB).One thousand megabytes called Gigabytes (GB).
The RAM of notebooks may accept information to 10 megabytes.Besides of Ram, Notebooks used also flash cards or PCMCIA cards-Personal Computer Memory Cards International Association.This cards are small as a credit cards,each one may use for memory,modem and network adapter.to place it or not in notebooks.If you place the memory card in notebooks it will be run fast because you added it.
The RAM of notebooks may accept information to 10 megabytes.Besides of Ram, Notebooks used also flash cards or PCMCIA cards-Personal Computer Memory Cards International Association.This cards are small as a credit cards,each one may use for memory,modem and network adapter.to place it or not in notebooks.If you place the memory card in notebooks it will be run fast because you added it.
Hard disk is the permanent bank of information it is different in RAM.If you switch off computer all information you put down will be lost but the information in hard disk will not lost.HArd disk accept 200 MB or above.Notebooks use baterry call NICAD Nickel Cadmium.If it is empty you can charge to 100 times.You can use it to 5 hours.NIHM Nickel Metal Hydride is also a baterry of notebooks.
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