- PC
- PC-XT
PC:-
PC(personal computer) is smallest computer among the entire computer, it has extermal memory as floppy disk and the primary memory is very small. It uses just for word processing and small work. It is cheaper in the all computer.
PC-XT:-
(personal computer with extended technology) this computer has secondary memory both floppy disk and the hard disk. It has the multi tasking facility where windows environment can be work. The speed and capacity of his computer are better than the PC but not much high. This computer can be use for small documentation, simple DTP work, and other official work. It's work -length between 16 to 32 bits.
PC-AT
(personal computer with advance technology) it is faster and more capacity than the PCXT; in this computer coprocessor is in built in the main processor. It can be work for office documentation, multimedia presentation, internet browsing etc.
Laptops :-
Laptop computers have similar hardware as of ordinary desktop PC s but are more compact, roust and portable. They have flat lightweight LCDs screen instead of video display monitors. Following the figure shows a typical laptop. It got it's name because you can place it on your lap and work. They have facility for mobile internet connection also. Executive who are on the move take full advantage of these mobile machines. They can be in contact with their company using internet facility while they are on the move . A smaller size company is known as Note-book computer.
Painting Computer /Digital Diary /Notebook /PDAs : a hand -sized computer. Palmtop have no keyboard but the screen serves both as an input and output device, A Palmtop is a small light weight portable computer with most features of Notebook computer .
Concepts of Hardware and software
Hardware is the part of the computer system that we can see and can physically touch to the part. Keyboard, mouse, CPU, monitor are come to the hardware part even inside the CPU or cable which connected to the various part are come in to hardware.
Characteristics of Computer
MEMORY :-
In the computer system memory is used to store various type of information. It can store large amount of data in its memory. The stored data can be recalled when requires. The storing capacity of the computer is measure is bit or byte. This characteristics is very useful for doing the repeated jobs.
ACCURACY :-
The accuracy on the computer of the computer is depends on the number of bits used for computation. Again that depends on the microprocessor used in it. Computer always given the exact results. The possibility of committing mistake is mostly by the programmer or by the user. The accuracy is much useful in the engineering and scientific applications.
SPEED :- The analytical speed of the computer is much more than human being. The computer performs a work that can do by the man in day or month within second or min. It depends on the microprocessor used in the computer and access time of memory and other peripheral devices.
VERSATILITY :- It means charging a function at an instant, for example make a mark sheet and after an instant make a account with same speed and accuracy. But can also perform more than one task at time.
Input devices :- The devices through which the data are entered into the computer are called input devices. Computers have tremendous ability to process data but it is the input devices that limit their speed. Hence more and more powerful input devices are being developed. It is the input devices that are most frequently handled by users, radical changes have occurred over the year in the methods, media and devices used for data entry. Therefor the trend is to design the input devices that are easy to operate, allows the maximum freedom of expression, and is as convenient as possible. As the data very in their type and format, numerous kinds of input devices have been developed. Some are ideal for entering letters and documents;others provide a form at for drawings and maps; still other allow easy and accurate input of numbers and figures.
Keyboard:-the CPU of the computer understands electronic signals through keyboard to the CPU. It is the device by which the data can be transferred into the computer. The user communicates with the computer by keying the instruction. The keys are devided in four categories, on their function.
1) Alphabet keys
2) Function keys
3) Special character keys
4) Numerical keys
Generation keyboard contents the key of 101 or 104 keys but some special keyboard may contain more than 104 keys for allowing more function like the function of internet, multimedia functions etc.
Painting Computer /Digital Diary /Notebook /PDAs : a hand -sized computer. Palmtop have no keyboard but the screen serves both as an input and output device, A Palmtop is a small light weight portable computer with most features of Notebook computer .
Concepts of Hardware and software
Hardware is the part of the computer system that we can see and can physically touch to the part. Keyboard, mouse, CPU, monitor are come to the hardware part even inside the CPU or cable which connected to the various part are come in to hardware.
Characteristics of Computer
MEMORY :-
In the computer system memory is used to store various type of information. It can store large amount of data in its memory. The stored data can be recalled when requires. The storing capacity of the computer is measure is bit or byte. This characteristics is very useful for doing the repeated jobs.
ACCURACY :-
The accuracy on the computer of the computer is depends on the number of bits used for computation. Again that depends on the microprocessor used in it. Computer always given the exact results. The possibility of committing mistake is mostly by the programmer or by the user. The accuracy is much useful in the engineering and scientific applications.
SPEED :- The analytical speed of the computer is much more than human being. The computer performs a work that can do by the man in day or month within second or min. It depends on the microprocessor used in the computer and access time of memory and other peripheral devices.
VERSATILITY :- It means charging a function at an instant, for example make a mark sheet and after an instant make a account with same speed and accuracy. But can also perform more than one task at time.
Input devices :- The devices through which the data are entered into the computer are called input devices. Computers have tremendous ability to process data but it is the input devices that limit their speed. Hence more and more powerful input devices are being developed. It is the input devices that are most frequently handled by users, radical changes have occurred over the year in the methods, media and devices used for data entry. Therefor the trend is to design the input devices that are easy to operate, allows the maximum freedom of expression, and is as convenient as possible. As the data very in their type and format, numerous kinds of input devices have been developed. Some are ideal for entering letters and documents;others provide a form at for drawings and maps; still other allow easy and accurate input of numbers and figures.
Keyboard:-the CPU of the computer understands electronic signals through keyboard to the CPU. It is the device by which the data can be transferred into the computer. The user communicates with the computer by keying the instruction. The keys are devided in four categories, on their function.
1) Alphabet keys
2) Function keys
3) Special character keys
4) Numerical keys
Generation keyboard contents the key of 101 or 104 keys but some special keyboard may contain more than 104 keys for allowing more function like the function of internet, multimedia functions etc.
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