Boolean Logic
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OR gate
• one variable must fit the requirements • Christmas hat
NOR gate
• opposite of OR gate • Christmas hat with circle
AND gate
• both variables must fill the requirements • mushroom
NAND gate
• opposite of AND gate • mushroom with circle
XOR gate
• same as OR gate except if both variables are 1 or 0 then it has an output of 0/false • Christmas hat with curved line
XNOR gate
• opposite of XOR gate • Christmas hat with curved line and circle
Buffer
• keeps input same • triangle
NOT gate
• makes the variable its opposite • triangle with circle
What is the pattern for truth tables
1,2,4,8,16
What does A*B mean
A AND B
What does A + B mean
A OR B
What does A with a line above it mean
NOT A
What is one rule for writing logic expressions
Must be all capital