an 8-bit ALU with multiple functions. COMMANDS: 0000 Add 0001 Subtract 0010 OR 0011 NOR 0100 AND 0101 NAND 0110 XOR 0111 XNOR 1000 Logical Shift Left 1001 Circular Shift Left 1010 Logical Shift Right 1011 Circular Shift RIght