Digital devices 1&2 Flashcards
List input and output devices
Input:
Keyboard, Mouse, Scanner, Microphone, webcam, Scanner
Output:
Monitor, speaker, printer, projector, Plotter, Headphones
What are Adaptive technologies
These are technologies that
have been designed specifically
to aid people with disabilities.
They include both hardware
and software.
What are Accessibility device’s + examples
accessibility Devices are
specifically created to allow
accessibility for people with disabilities
examples include:
Trackball, touchscreen, eye motion sensors, and Barley Embosser
Storage devices + examples
Storage devices are a type of peripheral device used for storing, backing up, and sharing data, usually
for individual use where a network is not available
Examples Including
1. HDDs
2. SSDs
3. USB memory stick
4. SD Cards
5. Optical disk (DVD, CDS, Blu-ray)
Hard disk drives
Magnetic storage devices, are commonly used
as the primary internal storage device but can be
external.
Characteristics and limitations
- Large storage capacity (I Terabyte or more).
Low cost on a per-byte basis.
Very reliable.
Slower than SSDs at loading data.
External HDDs are not as portable as some
other options.
Solid state drives
are flash memory devices commonly used as the
primary storage in portable computing devices
like tablets and laptops.
Characteristics and limitations
Very fast data read/write speeds.
Low power consumption.
Extremely reliable as they have no moving
parts which can be damaged.
SD cards
Are small flash memory cards that are commonly
used for storage in digital cameras and some
smartphones.
Characteristics and limitations
Very small and portable.
Easy to transfer between devices with an SD card
readers.
Very small storage capacity, generally around
G4GB—greater capacity is costly.
USB memory sticks
Are small flash memory devices that connect
through a USD port.
Characteristics and limitations
Extremely portable device.
Compatible with most computer systems via
USD ports.
Storage capacity is low when compared to
SSDs and HDDs.
Only have a finite number of writes before they
break.
Optical disks
Such as CDs, DVDs, and Blu-ray discs are used for
software, music, and movies.
Characteristics and limitations
Small and portable.
A lot of devices have the built-in capability to read optical
discs, with external devices, being inexpensive if needed.
The archival stability of writable media can be questionable.
Fragile and easy to damage.
List all + definition Types Of operating system
The operating system is what coordinates all the operations of your computer. It manages all the
resources on the computer, such as the CPU and RAM, and controls the software and hardware.
Type of OS
1. Real Time OS
2. Single user single task Os
3. Single user multi task Os
4. Multi user multi task Os
Real-time operating systems
Inputs are processed and responded too instantaneously.
Why choose real-time OS?
* It provides a fast response.
* It is best used where inputs such as Automatic barking system, traffic lights and air traffic control systems must be processed and responded too immediately.
Single user/single task operating system
One user can use the system at a
time and one application can run
at a time.
Why choose the single-user single
task?
* It requires fewer resources.
* It is best used on devices that
have limited processing and
memory, which could not handle
running multiple applications, for
example basic mobile phones or
a simple handheld game (such as
a Virtual Pet).
Single-user multitasking operating
systems
One user can use the system at a time, but many
applications can run simultaneously.
Why choose single-user multitasking?
* It allows the user to use several applications at
once.
* It is best used on systems where a user
needs to be able to switch quickly between
applications, for example, an office worker using
a laptop or desktop PC.
