// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/01/Or.hdl

 /**
 * Or gate:
 * out = 1 if (a == 1 or b == 1)
 *       0 otherwise
 */

CHIP Or {
    IN a, b;
    OUT out;

    PARTS:
    Not(in=b,out=negB);
    Not(in=a,out=negA);
    Nand(a=a,b=negB,out=out1);
    Nand(a=out1,b=b,out=out2);
    Nand(a=negA,b=out2,out=out);
}