History and Components of a Modern Mainframe Computer

Mainframe computers are critical for some of the largest corporations in the world. Each mainframe has more than one modern processor, RAM ranging from a few megabytes to multiple-score gigabytes, and disk space and other storage beyond anything on a microcomputer. A mainframe can control multiple tasks and serve thousands of users every second without downtime.

The chief difference between mainframes and other computing systems is the level of processing that takes place. Mainframes are also different in terms of data bandwidth, organization, reliability, and control. Big organizations-banking, healthcare, insurance, and telecom companies, etc.-use mainframes for processing critical commercial data.

In this article, we discuss the evolution of mainframe computers and their components.

History of mainframe computers

IBM developed a critical part of mainframe computing, the Automatic Sequenced Controlled Calculator (ASCC) for arithmetic operations, in 1944. From the late 1950s through the 1970s, several companies manufactured mainframes: IBM, Burroughs, RCA, NCR, General Electric, and Sperry Rand, for example. Since then, System / 390 by IBM is the only kind of mainframe in use. It evolved from IBM's System / 360 in 1960.

An Early mainframe occupied a huge space. New technologies have drastically reduced the size and cost of the hardware. A current-generation mainframe can fit in a small closet.

Components of a modern mainframe computer

Like a PC, a mainframe has many components for processing data: operating system, motherboard or main board, processor, controllers, storage devices, and channels.

• Motherboard: The motherboard of a mainframe computer consists of a printed circuit that allows CPU, RAM, and other hardware components to function together through a concept called "Bus architecture". The motherboard has device slots for input cards and cable interfaces for various external devices. Where PC motherboards use 32- or 64-bit buses, mainframes use 128-bit buses. General instructions regarding the internal architecture help the motherboard connect to the other devices and retrieve data using binary computation.

• Processor: A CPU acts as the central processing point in mainframe architecture and includes an Arithmetic Logic Unit (ALU) for performing arithmetic calculations. It also works as a controller for the bus architecture and handles traffic and data requests. The processing power of mainframes is much higher compared to PCs, so that they can handle huge amounts of data.

• Storage devices: Storage devices are for entering, retrieving, storing, and recording data. Many are external devices, such as hard drives, tape drives, and punch card readers, all connected to terminals of the mainframe and controlled by the CPU. Their capacity for data storage can be hundred or even thousands of times that of a PC.

• Communication controllers: Communication controllers allow remote computers to access a mainframe. With the help of networks, LAN or WAN, communication controllers establish connections with various devices, perform data transmission over communication channels, and keep track of users at terminals.

• Channels: The "channels" are the cables used to connect the CPU and the main storage to other parts of the system and make sure that data is moved in a systematic way without losing its integrity.

Modern mainframes have advanced features such as expanded service management capabilities, cross-platform integration facilities, etc. And so are suitable for critical data center operations. The cost of maintaining modern mainframes is much less compared to older models.

What Is Car Body Glass Coating?

Glass coating is an inorganic material made of a Silica or a Quartz-Silane-based compound. It is used to protect the painted surfaces of car bodies. It is less likely to stain. Unlike traditional wax, its luster and protection can be long-lasting once it is applied. This is because they do not contain materials that oxidize (bind with oxygen). Oxidation weakens the original protection and shine of many car products, thus rendering the car surface prone to damage. It is easy to maintain, provides clean, shiny surfaces and long-lasting protection.

What is the difference between coating and wax?

The main component of wax is carnauba wax oil, which is extracted from palm trees. In recent years, some waxes have added petroleum. Higher quality waxes contain more carnauba oil. Carnauba wax is oil based, so it has water-repellent characteristics and can obscure scratches. However, there are also disadvantages. Waxes can easily become dirty because oil has a high viscosity (thick and sticky). This means dirt can stick to it. Also, wax can easily melt and deteriorate because it is sensitive to heat. Sunshine or engine heat can promote deterioration and cause wax to melt off the car’s surface. Wax can also break down in the rain or when the car is washed.

On the other hand, coating has a chemical composition of silicon, silica, fluorine and titanium. These molecules form a film coating that penetrates between the molecules of the car’s painted surface, creating a very powerful protective layer. Resistant to dirt, heat and rain, coating’s protection and shine will last over a longer period than wax.

There are various kinds of coatings that range in application complexity from simple, which any consumer can apply, to products for professional use only.

During its application, if the car’s surface is dirty and rough, materials will not adhere to car body paint, so surface preparation before application is important.

Types of Glass Coatings

Glass-based coatings can be broadly divided into two categories: quartz-silane based coatings and silica-based coatings.

The quartz-silane-based glass coating, also known as “completely cured glass film type” achieves very high gloss and strong durability. It protects the car body by creating a cured coating of silica on the car’s surface. However, it takes about three weeks for the coating to be fully cured, which is a drawback. It is also expensive because it takes a long time for the product to be formulated.

The silica-based glass coating, also known as “glass fiber type “, also makes a film, coating the surface of the car body. It is fixed to a silicon polymer molecule. It is an easy formulation and, therefore, is costs less to produce. However, its durability and water repellency is inferior compared to the quartz-silane-based.

In addition, some of the fluorine-based coatings, such as Teflon, are used to coat car bodies. They are excellent in durability. However, they are inferior compared to glass coatings and more expensive to formulate. As a result, glass coatings are on the cutting edge of technology’s focus of exploration.

A Glass Coating Hybrid

Currently, there is debate about whether hydrophilic (attracts water) products are more effective than hydrophobic (repels water) products for car care. Glass is hydrophilic. The new types of glass coatings are hybrids, adding a silicone resin layer to the existing glass layer to change the hydrophilic trait of glass to hydrophobic, thus creating a strong water repellant product.

Classification of Computers

Computers are available in different shapes, sizes and weights, due to these different shapes and sizes they perform different sorts of jobs from one another.

They can also be classified in different ways. All the computers are designed by the qualified computer architectures that design these machines as their requirements.

A computer that is used in a home differs in size and shape from the computer being used in a hospital. Computers act as a server in large buildings, while the computer also differs in size and shape performing its job as a weather forecaster.

A student carrying a laptop with him to his college is different in shape and size from all the computers mentioned above.

Here we are going to introduce different classifications of computers one by one. We will discuss what are in classifications and what job they perform.

Super computer

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.

Governments specially use this type of computer for their different calculations and heavy jobs. Different industries also use this huge computer for designing their products.

In most of the Hollywood’s movies it is used for animation purposes. This kind of computer is also helpful for forecasting weather reports worldwide.


Another giant in computers after the super computer is Mainframe, which can also process millions of instruction per second and capable of accessing billions of data.

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.


This 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.

Personal computers

Almost all the computer users are familiar with the personal computers. They normally know what the personal computer is and what are its functions.

This is the computer mostly preferred by the home users. These computers are lesser in cost than the computers given above and also, small in size; they are also called PCs in short for Personal computers.

This computer is small in size and you can easily arrange it to fit in your single bedroom with its all accommodation. Today this is thought to be the most popular computer in all.

Notebook computers

Having a small size and low weight the notebook is easy to carry to anywhere. A student can take it with him/her to his/her school in his/her bag with his/her book.

This is easy to carry around and preferred by students and business people to meet their assignments and other necessary tasks.

The approach of this computer is also the same as the Personal computer. It can store the same amount of data and having a memory of the same size as that of a personal computer. One can say that it is the replacement of personal desktop computer.

This is one of the unique articles posted weekly on http://www.computer-and-printer-reviews.com.

Fashion Jewelry Redefines Feminine Grace

There’s wearing ornamental pieces made of gold, platinum, and silver, and then there’s opportunity to wear fashion statement jewelry. With the modern lifestyle adding different dimensions to the experience of wearing jewelry, the contemporary women are bound to add a piece of the fashion pie in their wardrobes.

While heading for a party from desk, one may not find proper time to select accessories. What is required here is a piece that will not be too awkward at office, as well as, add glamor to the dinner party. Fashion statement jewellery are best to gear up any attire. This kind of accessories include all kinds of earrings, necklaces, rings and bangles. Marvelous bracelets with minimal intricacies, extraordinary rings with stones, edgy, bold necklaces and other statement pieces can help changing casual into classy and elegant. A piece of jewelry becomes attention grabber when it amplifies the outlook within.

Wearing something that grabs the attention with its magnificence may not be new. However, wearing something that is totally different and capturing the attention of an audience just for its difference is fashion statement. Statement jewellery for women help to pull an outfit together. What seems drab and boring can turn into an attractive appearance with these pieces. Clothes are a way of expressing the self. Addition of the bold helps to express the courageous and defying self.

Every matter in the world has its own advantages and disadvantages. The biggest advantage of wearing fashion statement jewelry is that it is a stunner in itself. One does not need to embellish the look with additional accessories. Most importantly, the body part on which the fashion piece is adorned is highlighted the most. However, it is also known fact that an erroneous match to put up the bravest look may turn into disaster. It is important to be careful while choosing your statement jewelry. A balance between each part of the look helps to avoid donning a wrong outfit. A Statement jewellery is the focus of one’s look. It is wrong to try to wear all kinds of statement jewelry together. It makes the look unbalanced and verging to ridiculous. Usually one piece of fashion statement jewelry is enough for the trendy appearance.

With traditional jewelry stores still fashioning jewelry with monotonous regularity, it is time to indulge in product discovery. A fashion statement is never defined. It is usually defined by individuals with their respective choices. Though there are few ways in which statement jewelry are fashioned by modern women today, there are always scope for innovations.