Re: Eval button keeps being disabled

Posted by yusufgandhi on
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/Eval-button-keeps-being-disabled-tp4025192p4025195.html

Thank you for your prompt reply! And it solved the problem!

Please be patient if I have further questions regarding this NAND2TETRIS program :)

On Mon, Oct 8, 2012 at 11:03 PM, cadet1620 [via Nand2Tetris Questions and Answers Forum] <[hidden email]> wrote:

It looks like the instructions in the Hardware Simulator Tutorial are incorrect.

Copy your Xor.hdl into the projects\00 directory and open that copy in the simulator and you should be able to edit and evaluate as described. Make sure that when you click on "PARTS:" all the chips displayed have type BuiltIn.

What's happening is that when you load your Xor.hdl from projects\01 it is trying to use the Not, And and Or parts in the projects\01 directory. Since you haven't done project 1 yet, these parts have no implementation and the Hardware Simulator is silently failing. Note that in your screenshot (and the one in the tutorial) the chip types are Composite.

When you start on project 1, it is very important that you implement and test the chips in the order listed in 1.3 to prevent this sort of problem.

--Mark

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