Implementation of the adder chips and the ALU
1. Half-Adder
2. Full-Adder
3. Multi-Bit Adder
4. Incrementer
A special-purpose chip dedicated to adding the constant 1 to a given number.
5. Arithmetic Logical Unit
The Hack ALU computes a fixed set of functions out ¼ fiðx; yÞ where x and y are the chip’s two 16-bit inputs, out is the chip’s 16-bit output, and fi is an arithmetic or logical function selected from a fixed repertoire of eighteen possible functions. We instruct the ALU which function to compute by setting six input bits, called control bits, to selected binary values.
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