This video is about how computers calculate - using the ALU - Arithmetic Logic Unit. It shows the way one is constructed and how it works. This video is useful for A level Computer Science - you need to understand the principles of logic gates - half adders and full adders for that.
The logic gates are also useful to know for GCSE of course.
1) What is the role of the ALU?
2) What is adding one to a number known as?
3) True and False are represented in binary how?
4) Draw a truth table for and XOR gate.
5) Which logic gates make up a Half Adder?
6) What is the AND gate used for?
7) What is a Full Adder made up of?
8) What is an overflow error?
9) What level in the original PAC-MAN caused an overflow - why?
10) Which Intel ALU is mentioned at least twice in this video? Why was it significant?
11) How many bits could it add?
12) What is the role of a flag bit in an ALU?
13) Describe an example of how the negative flag can be used.