dos2unix old files
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/ALU.hdl
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/**
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* The ALU (Arithmetic Logic Unit).
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* Computes one of the following functions:
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* x+y, x-y, y-x, 0, 1, -1, x, y, -x, -y, !x, !y,
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* x+1, y+1, x-1, y-1, x&y, x|y on two 16-bit inputs,
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* according to 6 input bits denoted zx,nx,zy,ny,f,no.
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* In addition, the ALU computes two 1-bit outputs:
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* if the ALU output == 0, zr is set to 1; otherwise zr is set to 0;
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* if the ALU output < 0, ng is set to 1; otherwise ng is set to 0.
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*/
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// Implementation: the ALU logic manipulates the x and y inputs
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// and operates on the resulting values, as follows:
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// if (zx == 1) set x = 0 // 16-bit constant
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// if (nx == 1) set x = !x // bitwise not
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// if (zy == 1) set y = 0 // 16-bit constant
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// if (ny == 1) set y = !y // bitwise not
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// if (f == 1) set out = x + y // integer 2's complement addition
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// if (f == 0) set out = x & y // bitwise and
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// if (no == 1) set out = !out // bitwise not
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// if (out == 0) set zr = 1
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// if (out < 0) set ng = 1
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CHIP ALU {
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IN
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x[16], y[16], // 16-bit inputs
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zx, // zero the x input?
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nx, // negate the x input?
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zy, // zero the y input?
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ny, // negate the y input?
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f, // compute out = x + y (if 1) or x & y (if 0)
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no; // negate the out output?
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OUT
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out[16], // 16-bit output
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zr, // 1 if (out == 0), 0 otherwise
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ng; // 1 if (out < 0), 0 otherwise
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PARTS:
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// Put you code here:
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Mux16(a=x, b=false, sel=zx, out=xa);
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Not16(in=xa, out=xb);
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Mux16(a=xa, b=xb, sel=nx, out=xc);
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Mux16(a=y, b=false, sel=zy, out=ya);
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Not16(in=ya, out=yb);
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Mux16(a=ya, b=yb, sel=ny, out=yc);
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And16(a=xc, b=yc, out=xandy);
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Add16(a=xc, b=yc, out=xplusy);
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Mux16(a=xandy, b=xplusy, sel=f, out=xf);
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Not16(in=xf, out=xn);
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Mux16(a=xf, b=xn, sel=no, out=out, out[15]=ngr, out[0..7]=zri, out[8..15]=zrj);
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Or8Way(in=zri, out=zrm);
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Or8Way(in=zrj, out=zrn);
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Or(a=zrm, b=zrn, out=zro);
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Not(in=zro, out=zr);
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Mux(a=false, b=true, sel=ngr, out=ng);
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}
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/ALU.hdl
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/**
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* The ALU (Arithmetic Logic Unit).
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* Computes one of the following functions:
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* x+y, x-y, y-x, 0, 1, -1, x, y, -x, -y, !x, !y,
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* x+1, y+1, x-1, y-1, x&y, x|y on two 16-bit inputs,
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* according to 6 input bits denoted zx,nx,zy,ny,f,no.
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* In addition, the ALU computes two 1-bit outputs:
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* if the ALU output == 0, zr is set to 1; otherwise zr is set to 0;
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* if the ALU output < 0, ng is set to 1; otherwise ng is set to 0.
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*/
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// Implementation: the ALU logic manipulates the x and y inputs
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// and operates on the resulting values, as follows:
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// if (zx == 1) set x = 0 // 16-bit constant
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// if (nx == 1) set x = !x // bitwise not
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// if (zy == 1) set y = 0 // 16-bit constant
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// if (ny == 1) set y = !y // bitwise not
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// if (f == 1) set out = x + y // integer 2's complement addition
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// if (f == 0) set out = x & y // bitwise and
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// if (no == 1) set out = !out // bitwise not
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// if (out == 0) set zr = 1
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// if (out < 0) set ng = 1
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CHIP ALU {
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IN
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x[16], y[16], // 16-bit inputs
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zx, // zero the x input?
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nx, // negate the x input?
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zy, // zero the y input?
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ny, // negate the y input?
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f, // compute out = x + y (if 1) or x & y (if 0)
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no; // negate the out output?
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OUT
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out[16], // 16-bit output
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zr, // 1 if (out == 0), 0 otherwise
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ng; // 1 if (out < 0), 0 otherwise
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PARTS:
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// Put you code here:
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Mux16(a=x, b=false, sel=zx, out=xa);
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Not16(in=xa, out=xb);
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Mux16(a=xa, b=xb, sel=nx, out=xc);
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Mux16(a=y, b=false, sel=zy, out=ya);
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Not16(in=ya, out=yb);
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Mux16(a=ya, b=yb, sel=ny, out=yc);
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And16(a=xc, b=yc, out=xandy);
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Add16(a=xc, b=yc, out=xplusy);
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Mux16(a=xandy, b=xplusy, sel=f, out=xf);
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Not16(in=xf, out=xn);
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Mux16(a=xf, b=xn, sel=no, out=out, out[15]=ngr, out[0..7]=zri, out[8..15]=zrj);
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Or8Way(in=zri, out=zrm);
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Or8Way(in=zrj, out=zrn);
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Or(a=zrm, b=zrn, out=zro);
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Not(in=zro, out=zr);
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Mux(a=false, b=true, sel=ngr, out=ng);
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}
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@@ -1,33 +1,33 @@
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/Adder16.hdl
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/**
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* Adds two 16-bit values.
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* The most significant carry bit is ignored.
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*/
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CHIP Add16 {
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IN a[16], b[16];
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OUT out[16];
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PARTS:
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// Put you code here:
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HalfAdder(a=a[0], b=b[0], sum=out[0], carry=carry0);
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FullAdder(a=a[1], b=b[1], c=carry0, sum=out[1], carry=carry1);
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FullAdder(a=a[2], b=b[2], c=carry1, sum=out[2], carry=carry2);
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FullAdder(a=a[3], b=b[3], c=carry2, sum=out[3], carry=carry3);
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FullAdder(a=a[4], b=b[4], c=carry3, sum=out[4], carry=carry4);
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FullAdder(a=a[5], b=b[5], c=carry4, sum=out[5], carry=carry5);
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FullAdder(a=a[6], b=b[6], c=carry5, sum=out[6], carry=carry6);
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FullAdder(a=a[7], b=b[7], c=carry6, sum=out[7], carry=carry7);
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FullAdder(a=a[8], b=b[8], c=carry7, sum=out[8], carry=carry8);
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FullAdder(a=a[9], b=b[9], c=carry8, sum=out[9], carry=carry9);
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FullAdder(a=a[10], b=b[10], c=carry9, sum=out[10], carry=carry10);
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FullAdder(a=a[11], b=b[11], c=carry10, sum=out[11], carry=carry11);
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FullAdder(a=a[12], b=b[12], c=carry11, sum=out[12], carry=carry12);
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FullAdder(a=a[13], b=b[13], c=carry12, sum=out[13], carry=carry13);
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FullAdder(a=a[14], b=b[14], c=carry13, sum=out[14], carry=carry14);
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FullAdder(a=a[15], b=b[15], c=carry14, sum=out[15], carry=carry15);
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/Adder16.hdl
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/**
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* Adds two 16-bit values.
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* The most significant carry bit is ignored.
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*/
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CHIP Add16 {
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IN a[16], b[16];
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OUT out[16];
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PARTS:
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// Put you code here:
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HalfAdder(a=a[0], b=b[0], sum=out[0], carry=carry0);
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FullAdder(a=a[1], b=b[1], c=carry0, sum=out[1], carry=carry1);
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FullAdder(a=a[2], b=b[2], c=carry1, sum=out[2], carry=carry2);
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FullAdder(a=a[3], b=b[3], c=carry2, sum=out[3], carry=carry3);
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FullAdder(a=a[4], b=b[4], c=carry3, sum=out[4], carry=carry4);
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FullAdder(a=a[5], b=b[5], c=carry4, sum=out[5], carry=carry5);
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FullAdder(a=a[6], b=b[6], c=carry5, sum=out[6], carry=carry6);
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FullAdder(a=a[7], b=b[7], c=carry6, sum=out[7], carry=carry7);
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FullAdder(a=a[8], b=b[8], c=carry7, sum=out[8], carry=carry8);
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FullAdder(a=a[9], b=b[9], c=carry8, sum=out[9], carry=carry9);
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FullAdder(a=a[10], b=b[10], c=carry9, sum=out[10], carry=carry10);
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FullAdder(a=a[11], b=b[11], c=carry10, sum=out[11], carry=carry11);
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FullAdder(a=a[12], b=b[12], c=carry11, sum=out[12], carry=carry12);
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FullAdder(a=a[13], b=b[13], c=carry12, sum=out[13], carry=carry13);
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FullAdder(a=a[14], b=b[14], c=carry13, sum=out[14], carry=carry14);
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FullAdder(a=a[15], b=b[15], c=carry14, sum=out[15], carry=carry15);
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}
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@@ -1,20 +1,20 @@
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/FullAdder.hdl
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/**
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* Computes the sum of three bits.
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*/
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CHIP FullAdder {
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IN a, b, c; // 1-bit inputs
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OUT sum, // Right bit of a + b + c
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carry; // Left bit of a + b + c
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PARTS:
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// Put you code here:
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HalfAdder(a=a, b=b, sum=sumi, carry=carryi);
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HalfAdder(a=c, b=sumi, sum=sum, carry=carryj);
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Or(a=carryi, b=carryj, out=carry);
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}
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/FullAdder.hdl
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/**
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* Computes the sum of three bits.
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*/
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CHIP FullAdder {
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IN a, b, c; // 1-bit inputs
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OUT sum, // Right bit of a + b + c
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carry; // Left bit of a + b + c
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PARTS:
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// Put you code here:
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HalfAdder(a=a, b=b, sum=sumi, carry=carryi);
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HalfAdder(a=c, b=sumi, sum=sum, carry=carryj);
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Or(a=carryi, b=carryj, out=carry);
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}
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@@ -1,19 +1,19 @@
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/HalfAdder.hdl
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/**
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* Computes the sum of two bits.
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*/
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CHIP HalfAdder {
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IN a, b; // 1-bit inputs
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OUT sum, // Right bit of a + b
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carry; // Left bit of a + b
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PARTS:
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// Put you code here:
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Xor(a=a, b=b, out=sum);
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And(a=a, b=b, out=carry);
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}
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/HalfAdder.hdl
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/**
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* Computes the sum of two bits.
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*/
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CHIP HalfAdder {
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IN a, b; // 1-bit inputs
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OUT sum, // Right bit of a + b
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carry; // Left bit of a + b
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PARTS:
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// Put you code here:
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Xor(a=a, b=b, out=sum);
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And(a=a, b=b, out=carry);
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}
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@@ -1,18 +1,18 @@
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/Inc16.hdl
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/**
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* 16-bit incrementer:
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* out = in + 1 (arithmetic addition)
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*/
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CHIP Inc16 {
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IN in[16];
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OUT out[16];
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PARTS:
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// Put you code here:
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Add16(a=in, b[0]=true, b[1..15]=false, out=out);
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// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/02/Inc16.hdl
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/**
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* 16-bit incrementer:
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* out = in + 1 (arithmetic addition)
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*/
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CHIP Inc16 {
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IN in[16];
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OUT out[16];
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PARTS:
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// Put you code here:
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Add16(a=in, b[0]=true, b[1..15]=false, out=out);
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}
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