GU1: 1. Binary & Logic

Binary: How do you perform Two's Complement?

Invert the number and add one. 1010 = 0101+1 = 0110

Binary: What is Two's Complement used for?

Representing negative numbers.

Logic Gates: Name the basic logic gates.

AND, OR, NOT

Logic Gates: Name the extended logic gates.

NAND, NOR, XOR, XNOR

Logic Gates: What is a buffer gate?

A buffer gate outputs the same as the input.

Logic Gates: Describe the shapes of the logic gates on a diagram.

Buffer = triangle

AND = D shape

OR = curvy triangle/D

X = add a line

N = add a little circle

Binary: What is binary?

Base-2 system using 0 and 1.

Binary: Why do computers use binary?

Because electrical circuits have two states - on and off.