CompTIA®A+ Exam Notes : Install And Configure Common Computer Peripheral Devices

1. PC Hardware

1.11 Install and configure common peripheral devices

A KVM switch (short for Keyboard, Video or Visual Display Unit, Mouse) is a hardware device that allows a user to control multiple computers from a single keyboard, video monitor and mouse. A KVM module typically consists of a video port (VGA), mouse and keyboard ports (USB). PS/2 ports for mouse/keyboard are rarely used these days, and hence not provided usually.

If you are getting a keyboard error, you need to do one of the following things:

1. Check if the keyboard needs to be cleaned

2. Check if the keyboard cable has become loose

3. Check if one or more of the keys are stuck

4. If required, replace the keyboard.

The 'native resolution' specification points out one of the big differences between LCD and CRT displays. If you run an LCD at any resolution other than its native resolution, the display will become blurry, especially with text. The reason this happens on LCDs is that they are made up of tiny cells in a matrix (called the native resolution). For instance, if the native resolution is listed as 1280X1024, then there are 1280 cells across and 1024 cells down the screen. If you only display at 1024X768, then a large number of the pixels are being 'stretched' over multiple cells, which is what causes the image quality to degrade. The SPDF - Sony/Phillips Digital Interface is designed to transfer digital signals between devices without degrading the signal by converting it to analog. This preserves the quality of the signal delivered to digital recording and playback devices.

A scanner driver is usually called TWAIN. The Twain driver will always have another name, for example, Microtek calls theirs ScanWizard, and HP calls it as DeskScan or PrecisionScan. The TWAIN driver comes with the scanner, and knows how to operate this one brand of scanner hardware. Each scanner manufacturer provides their own TWAIN driver for their hardware.

Blu-ray drives are usually compatible with CD/DVD drives, but not the other way round.

There are two important varieties: These are BD-R and BD-RE

Blu-ray Disc Recordable (or BD-R) refers to two direct to disc optical disc recording technologies that can be recorded on to an optical disc with an optical disc recorder. BD-R discs can be written to once, whereas BD-RE (Blu-ray Disc Recordable Erasable) can be erased and re-recorded multiple times.

Storage capacity of blu-ray:

25GB (single-layer)

50GB (dual-layer)

Storage capacity of DVD:

4.7GB (single-layer)

8.5GB (dual-layer)

The Video Graphics Array (VGA) is one of the oldest connection standards which can still be found in large areas of computing equipment. It was widely used for video cards, TV sets,computer monitors, and laptops.

HDMI, which first appeared in 2003, is often found on modern televisions, but is also on most newer PC monitors, and is swiftly becoming required hardware on most laptops. HDMI is a digital standard, meaning the connection is either on (1) or off (0). The quality of the cable, the distance from the machine to the monitor and the type of metal in the connector are all virtually irrelevant (so don't pay a whole lot for your HDMI cable!) . HDMI handles sound as well as video, so a monitor with a headphone jack and an HDMI cable can output sound from your laptop. HDMI looks like the middle graphic.

Barcode reader: used to read and input code to identify the product.

The most commonly used port for connecting digital camera to a desktop computer is USB port, though older cameras used serial port. Most PCs see a Camera as mass storage connected to USB port.

Scanner : Scanner is a device that scans images, printed text, and handwriting etc and converts it to digital form or image. It is so named because the data is converted one line at a time or scanned down the page as the scanning head moves down the page.

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