BUS

What is computer bus? What are the types of a computer buses?

System bus or Buses:

Data is normally transferred between main storage and the processor along a device called a bus which is effectively a means of sending multiple bits of data in parallel. This also called the system bus. For example, all the bits of a word may be transferred in parallel in a single operation.

  

The micro computer has three local buses. These are

• Address bus;
• Data bus;
• Control bus.

                       These three makes the system bus.

                                                 

Address bus:

It is unidirectional, information flows over it only in one direction, from the CPU to the memory or I/O devices.

Data bus:

It is bidirectional and data can flow to and from the CPU through it.

Control bus:

It consists of a set of signals that is used to synchronize the activities of separate microcomputer elements.

Read More

DIFFERENT TYPES OF DIGITAL COMPUTER

Digital Computer!

Classify and discuss different types of digital computer.

There are four types of digital computer:

a). Micro computers;

b). Mini computers;

c). Main frame computers;

d). Super computers;

Micro computer:

In which the various integrated circuits and elements of a computer are replaced by single integrated circuit called a “chip”. Examples are the IBM pc, Apple Macintoshes, Dell.

Their continuing and rapid technology development had a major effect on the whole computer industry over the past twenty century.

Mini computers:

Physically small computers compared with mainframes. They are used for special purpose or smaller scale general purpose work. Example are DEC’S, VAX, RANGE.

Mainframes computers:

Large general purpose computes with extensive processing, storage and input/ output capabilities. The market for these computers is dominated by IBM.

Super computers:

A large and very powerful mainframe computer is called a supercomputer. The Cray X-MP is an example of supercomputer. Such supercomputers are applied to the solution of very complex and sophisticated scientific problem and for national security purposes of some advance nations.

Read More