Analog Computer-
Analog computer handle or process information which is of a
physical nature, as for example, Temperature, Pressure etc.
Digital Computer-
Digital computers process information which is essentially
in a binary or two-state form, namely zero and one.
When talking about computers we mostly refer to the digital
type of electronic machines. These are based on the measuring of analog or equivalent
physical value.
Types of digital computer-
- Microcomputer
- Minicomputer
- Mainframe
- Supercomputer
1.Microcomputer-
Can be classified into- Desktop PCs
- Sits on desks, rarely moved, large and bulky.
- Memory capacity, graphics capacity and software availability vary from one computer to another used both for business and home applications.
- Advantages-
- Small size.
- Low cost.
- Portability.
- Low computing power.
- commonly used for personal applications.
- Disadvantages-
- Low processing speed.
- Medium sized computer.
- also called the minis.
- e.g. IBM36, HP9000 Etc.
- Computing power lies between microcomputer and mainframe computer.
- Bigger size than PCs.
- Expensive than PCs.
- Multi-user.
- Difficult to use.
- More computing power than PCs.
- Used by medium sized business organizations, colleges, libraries and Backs.
- Known as enterprise servers.
- Occupies entire rooms or floors.
- Used for centralized users and small servers in a computing network.
- Large, Fast and expensive computer.
- Cost Millions of dollar
- e.g. IBM3091, ICL39 Etc.
- Bigger in size than minicomputers.
- Very expensive.
- Support a few hundred users simultaneously (Multi-users).
- Difficult to use.
- More computing power than minicomputer.
- Have to be kept in a special air conditioned room.
- Used in big business organizations and government departments.
- Fastest and expensive.
- Used by applications for molecular chemistry, advanced physics.
- Consists of several computers that work in parallel as a single system.
- Speed.
Generate a large amount of heat during operating.
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