System Unit Parts And Their Functions Pdf Printer

System unit parts and their functions pdf printer

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This tutorial explains computer peripheral devices and their function in details with examples. Learn how computer peripheral devices such as RAM, ROM, processor, input and out device, motherboard and storage device work with functions and specifications.

When a letter is pressed on a keyboard, the electronic signals are converted into binary form and stored into memory.

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The computer processes the data as bytes of information and converts them to the letters we see on the monitor screen or on a printed page.

The System Unit houses the central processing unit, memory modules, expansion slots, and electronic circuitry as well as expansion cards that are all attached to the motherboard; along with disk drives, a fan or fans to keep it cool, and the power supply.


All other devices monitor, keyboard, mouse, etc. Internal drives, such as the hard disk drive, are installed in internal bays that are not typically as accessible as the external drives pictured here. These types of port designs are based on whether or not fast data transmission rates are required by the device or not. Most computers come with basic types of ports serial, parallel, keyboard, mouse, and USB ; and expansion cards allow you to expand the available types needed by specific devices.

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Understanding the differences among connector types is useful and important, as the cable required to attach a device to your computer is specific to its connector, not to mention the port on the computer. Drives read from and write to storage media the physical material that can store data and programs. Resolution refers to the number of dots displayed in the X across and Y down co-ordinates.

System unit parts and their functions pdf printer

Typical screens are capable of displaying x dots. Dot Pitch measurement of how close together the pixels, or phosphor dots, are that make up an image. The smaller the dot pitch, the crisper the image,0.

Functions of the Major Hardware Components of A Computer

Refresh rate the vertical frequency, or the rate at which each pixel on a screen is re-drawn. A low refresh rate results in an image that flickers, resulting in eye-strain.

A refresh rate of 60Hz means the images is redrawn 60 times a second. Typical refresh rates are 60Hz, 72Hz and 75Hz. Display graphics - Visual output from your system. Works between the system's processor and monitor Relays the information received from the programs and applications running on the system to the monitor.

VDA embody certain standards.

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The general features of impact printers are uses force by applying hammer pins to strike the paper. Advantages : Less expensive, Fast some types , Can make multiple copies with multipart paper.

System unit parts and their functions pdf printer

Disadvantages : Noisy! Print quality lower in some types. Poor graphics or none at all. Dot matrix printers form characters using row s of pins, 9, 18, or 24 which impact the ribbon on top of the paper. Daisy wheel printers use a spoked wheel with characters placed at the end of each spoke.


A print hammer is used to strike the desired character onto the ink ribbon and then the paper. Resolution: A more numerical measure of print quality is printer resolution. Measured in dots per inch dpi , this determines how smooth a diagonal line the printer can produce.

Parallel Cables- send data 8 bits at a time. Distance from PC 50 ft.


The motherboard is the main circuit board of a computer. The chipset and other motherboard circuitry are the "smarts" of the motherboard. Their job is to direct traffic and control the flow of information inside the computer. The chipset is a critical part of any computer, because it plays a big role in determining what sorts of features the computer can support.

This saves the expense of replacing circuit boards and chips. It is a small, high-speed memory area that is placed between the processor and the system memory.

The most frequently used instructions are kept in cache memory so that the CPU can look in there first - allows the CPU to run faster because it doesn't have to take time to swap instructions in and out of main memory.

About The Basic Parts of a Computer with Devices

Large, complex programs such as complex spreadsheets or database management programs benefit the most from having a cache memory available. Pentium II processors generally come with at least KB of cache memory. Most desktops and notebooks use one of the three most popular types of synchronous dynamic random access memory SDRAM for the main system memory.

System unit parts and their functions pdf printer

Because DDR2 is able to operate with faster bus speeds, your memory doesn't hold back the performance of your processor. Generally speaking, motherboards are built to support only one type of memory.

They will not function and will not even fit in the same.

System unit parts and their functions pdf printer

Aside from the processor, the two most important factors affecting a PC's performance are RAM and hard disk capacity. Without enough RAM, the operating system must swap out storage space with the hard disk.

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This is Virtual Memory. Virtual memory is inherently slow!


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System unit parts and their functions pdf printer

Bytes Exact Bytes Approx. Network Cable Types and Specifications.