Input and Outputs and secondary storage.

Inputs and outputs are what makes electrical things work.

Items such as keyboards and touch screens are inputs and letters and the screen moving is the output.

There are many special devices that are inputs which are used for specific needs. Some people may not be able to use electrical appliances because of a disability.

Devices such as eye sensors, foot mouse, voice inputs, puff-suck switches and braille keyboards. These make it easier to use.  

Secondary storage.

Some are very expensive whilst many are cheap. CDs are the cheapest but do not carry as much memory and are slower. They are roughly £4
Flash memory is slightly more expensive but is smaller which makes it easier to carry it around. They get very expensive if they hold more memory. They are roughly around £6 but can go up to £30.
Magnetic hard disks are common and hold lots of memory but are internal.

Questions

1. control movement of data and instructions

    fetch data

    

2.  2.2GHz means 2.2 gigahertz. one gigahertz is 1 billion cycles a second


3. double the amount of cores.



4. cache memory is random access memory


5. speed 

Binary

 John
Binary is a number system that only uses 0 and 1 to represent all numbers. 0 and 1 can represent on and off.

logic gates determine outputs by processing inputs that are manipulated by the gates processor.

NOT gate

 
Input Output
0          1
1          0

AND gate


Input A  Input B    Output
    0          0                0
    0          1                0
    1          0                0
    1          1                1


OR gate

Input A        Input B       Output
0                  0                  0
0                  1                  1
1                  0                  1
1                  1                  1