Perfboard What It Is And What Is It? How Does It Work? -Step By Step Guide


Having an understanding of the role that earned the punch card leads to know the beginning of what was once the computer, through training a machine to store a given data set.

Since this function, another of its goals that prompted its creation was the need to reduce the use of people to perform a specific procedure. Through these principles, it managed to obtain, process and store information precisely within a short period of time.

The birth of the punched card

His first appearance is still debated to this day. However, the chronological data of its invention around 1725 as a «large roll of punched paper» allowing control a textile loom from a company in France.

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Based on this concept, different groups of engineers were responsible for improving the idea to apply it in their inventions a couple of years later.

 birth of punch card

To this day, it is considered the first CD-ROM that might exist in history , then IBM developed its main operation for achieving such storage.

Therefore, it is recognized punched cards as a sheet of varying size, which material is cardboard, which allows a number of drilling binary code to store a specific type of information.

Herman Hollerith tabulating machines and

This engineer was one of the founders of what is known today as IBM, which decided to use this type of card to survey the US population.

To achieve this, within the sheet a varied number of questions was introduced with two answers or probable data, < strong> being the right which was drilled in it . Once the punch card, this was placed in a container with mercury had wires on its top was obtained.

When any of these wirings was a hole in the sheet, mercury recorded in the information that was provided. Thus, punch cards were used for load a specific type of information automatically .

General features

The main concept of the punch card is something that has evolved over the years, because gradually improved until becoming what it is today. For those dates, these small sheets of cardboard is distinguished from any other by having specific characteristics.

Based on the binary method, the type of response that was pierced within it are organized in a specific column. The number of columns varied according to the size that had the card.

Also, these sheets were manufactured and distributed for a specific type of machine , so that it will only work with.

How worked these punch cards?

As you managed to read above, each card punched card was very resistant to different types of holes that were made in it. These marks varied according to the form that had the pencil is to say round, rectangular or oval. The IBM company proposed identify them as » chips» or » chads» .

Each of these holes was accompanied by «fields» which were nothing more than data variability characters, which contained mainly words or numbers lot. These fields were established in nearby columns to the card, usually within its edges.

 so that these punched cards working

One important aspect of the blades is that their corners had a specific type of cut that allowed people to determine the deck which belonged. At the time I finished each machine using a punch card, this was stored, destroyed or discarded to avoid duplication of information.

From this moment, the knowledge and practical use of the punch card allowed different companies evolve its principle . As a result, on your computer you have the ability to process and store all kinds of data through a magnetic and optical media, which is based on a similar method to that of these sheets used in the nineteenth century.

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