Mainframe computers are expensive, large centralized computer facilities where a super computer is connected to a number of terminals. A multi user mainframe computer has a large memory and is capable of speeds of the order of several billions of floating point operations per second. This computer is commonly used in big hospitals, air line reservations companies, and many other huge companies prefer mainframe because of its capability of retrieving data on a huge basis.This is normally to expensive and out of reach from a salary-based person who wants a computer for his home.This kind of computer can cost up to thousands of dollars.Mini computers are also multi user computers operating at comparatively slower speeds and lesser memory. In the mini computers some popular versions are PDP-11, DEC10 ,etc. Mini computer is next in he line but less offers less than mainframe in work and performance. These are the computers, which are mostly preferred by the small type of business personals, colleges, etc.Micro computers are often called as personal computers and they are based on micro processors manufactured by Intel, Motorola ,etc. These were designed for use in office or home. The home computer provides education, entertainment, information and communication facility in homes. The term microcomputer is generally synonymous with personal computer (PC), or a computer that depends on a microprocessor. Microcomputers are designed to be used by individuals, whether in the form of PCs, workstations or notebook computers. One can send e-mails, e-greetings, chat, play games, hear music, video conferencing, reserve tickets, do shopping and banking operations with the help of a home PC and internet without leaving one’s home. Office based PC’s on the other hand are used to carry out many other functions like maintaining databases and doing calculations.
Mainframe, Mini and Micro computers
July 23rd, 2010FACTS ON MEMORY SPEED
July 23rd, 2010Speed of memory is measured in megahertz or gigahertz or in terms of access time. Access time measures from when the memory module receives a data request to when the data becomes available. Memory chips and modules are marked with access time in the range of 80 ns to 50 ns. Lower the access time greater is the speed. Speed in here just indicates how quickly the memory module can deliver data on request once that request is made. The memory chips have the ability to synchronize with computer’s system clock making it easier to calculate the speeds. Whether the speed is in gigahertz or megahertz it becomes easier to compare speeds of different components and synchronize their functions. In order to understand speed of the system better it is essential to understand concept of system clock which resides on the motherboard. It sends signals to all other components in rhythm. It is possible for the components of the system to run slower than the system clock. Components of different speeds require a multiplication or division factor to synchronize the components. This is taken care of by system clock. The speed of memory used is always unimaginable and the access speed is something un acceptable. SDRAM speed is measured in megahertz (MHz). Speed markings on the memory chips may still specific nanoseconds, but in this case in represents the number of nanoseconds between clock cycles. To add to the confusion the markings on the chips don’t match the Mhz value. Here is a conversion chart. To calculate bytes per second you need to know the Bus Width and Bus Speed of your PC. The first thing to remember is 8-bits = 1 byte. If you have a 64-bit bus, than 8 bytes of information can be transferred at one time. (64 / 8 bits = 8 bytes). If your bus speed is 100Mhz (100 million clock cycles per second) and the bus width is 1 byte wide, the speed is 100 MB’s per second. With a 64-bit width, the speed is 800 MBs per second (64 / 8 * 100,000,000)
UNIX or Windows Hosting?
July 23rd, 2010There are many customers today that use UNIX hosting over Windows hosting. The difference
actually lies on the purposes of the customers and on what support they need for their
web hosting. If they need to use Microsoft products like ASP, MS Access, or VBScript, then
Windows hosting would be a better option. UNIX on the other hand, is more common with
web hosts because of its superior stability and affordable price. The ability of an operating
system to concurrently run programs that have been divided into subcomponents, or threads is
called Multithreading. This seems to bee another important requirement that
customers look into. On the server front, Unix has been closing in on Microsoft’s market share.
Unix is the leader in serving the Web. About 90% of the Internet relies on Unix operating systems running Apache,
the world’s most widely used Web server.Customers have the option to
choose the type of web servers they want to use for their webhosting. Best Unix Hosting is
offered by many hosting companies with a competitive and reasonable cost. The different Web
Hosting Types have these two kinds of web servers. But whichever web server the customer
chooses, the most critical elements to consider are those beneficial to the purposes of the
website or websites to be hosted. Many end users look into storage capacity and bandwidth,
web applications and management support, complete control panel solution, affordable price
and great customer service support from the hosting company.
Everything said and done, one more thing is to be considered: no one single type of operating system can offer
universal answers to all your computing needs. It is about having choices and making educated decisions.
SCIENCE AND TECHNOLOGY IN ENTERTAINMENT
July 23rd, 2010Science and Technology development plays an important role in entertainment. So many
electronic devices like television, computer, laptop, mobile phones were invented due to the
development of science and technology. These devices are well connected to the other devices
with wireless system, or by means of fiber optic system. Some of these devices will provide
various features like camera, radio, video recording, and live television. These devices will
entertain the people in number of ways by having these features. Life without entertainment seems
to be a impeccable impossibility these days. Everyone, everytime find one or the other means to
keep themselves entertained. Video coach buses and cars, fully comfy isolated compartment with music
discs and movie cd’s in flights, people seek for a way to keep themselves amused in one way or the
other. Living a life in a metro these days, people make use of every five or ten minutes break that
they get to make themselves relaxed and refreshed. The technology these days keep the people in this
speeding world move along. For many people, technology helps to make them realise that they are not
alone in their world. Webcams and internet bring lots of friends and family together. Social networking
sites bring new friends and family. Ipods, music players, and such accesories are now very much portable and
come in handy for a boring travel. Playstations and x box revolution has taken entertainment to a new level.
Lcd theatres and 3d movie theatres are again a big leap in entertainment realised only because of science and
technology. A laptop and a internet service provider, by any means, lets say a photon
for example, and nothing more is needed for a person these days. All this dreams is realised only with the help
of technology and science and their implications in entertainment. 
CLASSIFICATION OF COMPUTERS
July 23rd, 2010The first four generations of computers were based on the technology of the age to which they
belonged. They were thus based on the vacuum tube technology, the transistor and printed
circuit technology, the integrated circuit technology and the Very Large Scale Integrated
(VLSI)technology. The major feature of the fourth generation technology is that a microchip
weighing a few grams that is a thin silicon chip using 0.13 micron technology has a memory
capacity if one gigabyte. At present, development has entered areas of “Artificial Intelligence”.
These are called fifth generation computers. Today computer classification is based on various
other parameters such as the microprocessor used, the speed , the motherboard configuration
and many other factors. The latest computers are classified as mainframe computers, mini
computers and micro computers. Each of these have their own features which make them
advantageous to use in different fields of their own. The biggest in size, the most expensive in price than any other
is classified and known as super computer. It can process trillions of instructions in seconds.
This computer is not used as a PC in a home neither by a student in a college.
A main frame computer is commonly used in big hospitals, air line reservations companies, and many other
huge companies prefer mainframe because of its capability of retrieving data on a huge basis.
An amazingly high number of utilities for a computer have been developed and and sort
of a material in a hard copy can be transfered to a soft copy, technically speaking, into ones and
zeros. This has, more than every other advantage, reduced the storage size and increased the efficiency and
the quality into a fashionable manner. Every ounce increase in a technology takes mankind into a new
leap and yet, it has to be carefully harnessed.
Hello world!
July 8th, 2010Welcome to WordPress. This is your first post. Edit or delete it, then start blogging!