/**
 * Demultiplexor:
 * {a, b} = {in, 0} if sel == 0
 *          {0, in} if sel == 1
 */

CHIP DMux {
    IN in, sel;
    OUT a, b;

    PARTS:
    Nand(a = sel, b = sel, out = out1);
    Nand(a = sel, b = in, out = out2);
    Nand(a = out1, b = in, out = out3);
    Nand(a = out3, b = out3, out = a);
    Nand(a = out2, b = out2, out = b);
}