How do you derive logical true or false in practice?

Posted by frdschott on
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/How-do-you-derive-logical-true-or-false-in-practice-tp4035957.html

While I managed to figure out the Inc16 chip:

CHIP Inc16 {
    IN in[16];
    OUT out[16];
    PARTS:
    Add16(a[0]=true, b=in, out=out);
}

I am confused as to where do constant, logical 1's or 0's come from. Is this a silly question?

Excerpt from Appendix A:

> The constants true and false may also be used as buses, in which case the required width is
deduced implicitly from the context of the connection.

Where do they come from? They are obviously not produced out of thin air lol. How are they derived in practice?

I suppose they come directly from the voltage source, so let's say that for a 16-bit number, maybe I extend 16 conductive lines from the voltage and that's how I get my 1's? What about constant 0's? Are they just empty inputs in practice?