Order of operations and negating the 16 bit values.

[kingpinzs]

the order I do things are
zero the x
and or negate the value

same with Y value then
add or and it
then negate the output.

The code doesn't work at all.

Here is what I have.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    Mux16(a=x,b=false,sel=zx,out=xZeroed);/ /can out put zeroed and not zeroed

   Not16(in=xZeroed,out=InvertX);
  Inc16(in=InvertX,out=IncX);//outputs only negtive numbers

   Mux16(a=xZeroed,b=IncX,sel=nx,out=NegX);//can out put Negtive or not Negtive X

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    Mux16(a=y,b=false,sel=zy,out=yZeroed);/ /can out put zeroed and not zeroed y

   Not16(in=yZeroed,out=Inverty);
  Inc16(in=Inverty,out=Incy);//outputs only negtive numbers

   Mux16(a=yZeroed,b=Incy,sel=nx,out=NegY);//can out put Negtive or not Negtive y
 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Add16(a=NegX,b=NegY ,out=added);
And16(a=NegX,b=NegY,out=anded);

Mux16(a=anded,b=added,sel=f,out=addand);//first main output
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
   Not16(in=addand,out=InvertOut);
  Inc16(in=InvertOut,out=IncOut);//outputs only negtive numbers

Mux16(a=addand,b=IncOut,sel=no,out=out);
///////////////////////////////////////////////////////////////////////////////////////////////////////

but all I get is zeros or ones.

[milythael]

For each input (x, y) there are two bits which can affect them prior to their use together. This means we have a four value selector that chooses between:

zero	not	result	bits
0	0	original input	101 => 101
0	1	bitwise not the input	101 => 010
1	0	zero the input	101 => 000
1	1	bitwise not the zero	101 => 111

I hope this helps clarify things a little.

[cadet1620]

There are two types of negation, logical and arithmetic. Read milythael 's response and the description of the ALU carefully and be sure you understand the type of negation required. Ybakos wrote a great worksheet that will help you understand how the ALU works.

--Mark

[kingpinzs]

Thanks that helped out a lot. I got it all to work. Thanks again