These re probably the type of computer you are most familiar with. They come with a monitor (now usually a TFT screen), keyboard, mouse, CD-RW and a DVD-RW or at least a DVD-ROM.
Laptop Computors:
These are also very common. They usually have the same processors as desktops and similar sized main memory and
hard disk drive, although you will pay more for a laptop as a desktop with the
same specification. Laptops have the advantage that they can carried about
easily and run from a battery. Often they have built in wireless technology
allowing them to connected to network without having to use cables. Laptops do
not come with a mouse due to the fact that they are often used where there in
not a table to use a mouse on. Instead they have a touchpad built into them. You
would also expect a laptop to have a CD-RW and DVD-ROM as standard.
Palmtop Computers (sometimes called PDAs (Personal
Digital Assistants)):
These have a small touch senstive screen and come with a stylus
allowing the user to select things off screen. Data entry is usually done using
handwriting recognition although some PDAs do have a small keyboard. They can be
used to do tasks similar to ones done by desktop and laptops but more often they
are used for note taking, calendars, address books and a means of sending and
recieving email. A palmtop works together with a desktop or laptop so data can
be transferred between computers. This is done using a cable or using
Bluetooth wireless technology.
Mainframe Computers:
These are very large powerful
computer systems that are usually at the heart of a business. The mainframe
computer will have a very powerful processor, large amounts of main memory and a
huge backing storage capacity. They are accessed through one or more
terminals. Terminals consist of a screen, keyboard, mouse but no
processor as all the processing is done by the mainframe.
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