Logic Gates

Basic 


truth tables from wikipedia

And Gate: output is one only when both inputs are one

 Or Gate: output is one when either 1 or both inputs are 1

Inverted

Nand Gate: output is one unless both inputs are one
 

 Nor Gate: output is only 1 when no inputs are 1


 Combined

 Xor Gate: output is one when only one input is one ---- used for addition

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Purpose

To construct a working computer with a basic CPU, memory, input, and output CPU - using integrated circuits - Includes ALU for computations - main function CU - control operations sent to ALU from ram/memory ALU - 4 or 8 bit computations - Add, subtract, increment, decrement - maybe carry in? Memory - basic ram module - non-volatile memory for any software that is necessary Input - switch board? maybe keypad Output - screen - maybe need make some basic program to process inputs
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