MCS12 What is Scan code in the context of a keyboard 2. Impact printer.


IGNOU BCA second semester MCS012 theory important Questions with answers

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Question

Define the following terms:

1. Scan code in the context of a keyboard

2. Impact printer.


Answer

1. Scan code in the context of a keyboard:

In the context of a keyboard, a scan code refers to a unique identifier assigned to each key on a keyboard. When a key is pressed or released, the keyboard's hardware generates a scan code corresponding to that key. The scan code is then sent to the computer, which interprets it and performs the appropriate action, such as displaying the corresponding character on the screen or triggering a specific function associated with that key. Scan codes are typically standardized to ensure compatibility across different keyboards and computer systems.


2. Impact printer:

An impact printer is a type of printer that creates printed output by physically striking an inked ribbon against the paper. These printers work by using mechanical force to transfer ink onto the paper, typically through the use of a print head or a set of pins. The impact of the pins against the ribbon leaves behind an impression on the paper, forming characters or images.


Impact printers are known for their reliability and ability to create carbon copies since the forceful impact allows the ink to be transferred through multiple layers of paper. However, they are generally slower and noisier compared to modern non-impact printers such as inkjet or laser printers. Dot matrix printers are a common example of impact printers, where a matrix of pins strikes an inked ribbon to form characters and graphics on the paper.



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