ALU

The arithmetic logic unit handles arithmetic operations in the CPU.

Operators

The main operators include

• ADD
  • SUB: A - B = A + (-B)
  • MUL2: 2*A = A + A
• XOR
  • NOT: ~A = A XOR 1
• AND
• OR

Circuit

Arrangement of instruction opcodes may ease circuit construction. By experience, arithmetic and logic instructions should be separated.