7. How do input peripherals
work?
When a user press a key, one electric switch
is closed.
A chip detects that event and save it in a
buffer.
When it's possible, the information goes out
the buffer to be encoded in zeros and ones,
code which is sent to the computer through
the input port.
Processor receives the data and processes
it as the application or operating system may
decide.
User
presses
a key
Buffer
Encoding
PS/2
Processor (CPU)
d
01100010
R3-C4
Keyboard
9. Output Peripherals
Characteristics
The screen size is measured ever in
INCHES.
Resolution is expressed as a product
of pixels: 800 x 600, 1024 x 768, etc.
Printers are characterized by their
speed (in pages per minute, ppm) and
their resolution (in dots per inch, dpi)
12. Conclusion
Peripherals are devices
which can be connected to
the computer.
They allow the introduction
and exit of data.
We can sort them as:
Input Peripherals,
Output Peripherals, and
Input/Output Peripherals
Keyboard and Mouse are the
most important Input
Peripherals. Cameras, Webcams
and Scanners are Input
Peripherals too.
Monitor and Printer are main
Output Peripherals.
Hard Disk drives, Memory
Sticks, Re-writeable Disks, and
external connections (Ethernet,
Modem) are Input/Output
Peripherals.