Developer Builds ALU and Adder Chips in Nand2Tetris Project 2

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A developer documented their progress through Project 2 of the Nand2Tetris course, constructing chips including HalfAdder, FullAdder, Add16, Inc16, and an ALU using hardware description language. The builder started by analyzing truth tables and reused previously built chips to assemble more complex components, such as combining smaller adders to create a 16-bit adder. A key breakthrough came when the developer discovered that HDL features like bit slicing and fan-out could simplify designs significantly, replacing an overly verbose first attempt at Inc16. The ALU, initially considered the most daunting component, was tackled by processing control bits one at a time using Mux gates as conditional selectors. Fan-out proved essential for extracting single-bit status flags from the 16-bit ALU output, allowing the project to be completed successfully.

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