Unit 2.4 - Computational Logic

Unit 2.4 - Computational Logic

1. Binary - Is the representation of the 'presence' of electricity. ('No' = 1) ('Off' = 0)

2. Logic Gates take inputs and convert them to outputs.

3. Keywords: LOGIC GATE, TRANSISTOR, BIT (binary digit), LOGIC CIRCUIT, AND, OR, NOT

4. Transistors are used to change bits and perform calculations within a computer.

5. Every logic circuit can be made up from these 3 logic gates (AND , OR , NOT))

6. The outputs of logic gates can be shown through a Truth Table . The truth table shows the ouptut.

7. To calculate the number of rows to do: 2^number of inputs .

   • For example if you have 8 inputs then : 2^8 = 256 rows

8. 8 bits = 1 byte

   • 4 bits = nibble

9. When there are 3 inputs = use BIDMAS .

10. ¬ = not

11. V = or

12. ^ = and