This board has two IC adders. The adder on the top is a half adder that has an input of 2 bits, uses 2 logic gate ICs (XOR and AND) and has an output of 2 bits. The adder on the bottom is a full adder that has an input of 3 bits, uses 3 logic gate ICs (XOR, AND, and OR), and has an output of 2 bits. The attached schematic document also includes a version with universal logic gates. This design wasn’t actually manufactured, but instead shows that any digital logic circuit, simple or complex, can be made using only NAND or NOR gates.
Nicholas Borda – EE, 2023 – email@example.com