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diff --git a/computer-organization-experiment/alu.vhdl b/computer-organization-experiment/alu.vhdl
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+LIBRARY IEEE;
+USE IEEE.STD_LOGIC_1164.ALL;
+USE IEEE.STD_LOGIC_UNSIGNED.ALL;
+use ieee.numeric_std.all;
+
+entity alu is
+    port (A, B: in std_logic_vector(31 downto 0); ALUC: in std_logic_vector(3 downto 0); S: out std_logic_vector(31 downto 0); Z: out std_logic);
+end entity;
+
+architecture Behavioral of alu is
+begin
+    S <= A + B when ALUC(2 downto 0) = B"000"
+         else A and B when ALUC(2 downto 0) ?= B"001"
+         else A - B when ALUC(2 downto 0) ?= B"100"
+         else A or B when ALUC(2 downto 0) ?= B"101"
+         else A xor B when ALUC(2 downto 0) ?= B"010"
+         else std_logic_vector(signed(A) sll 16) and B"11111111111111110000000000000000" when ALUC(2 downto 0) ?= B"110"
+         else std_logic_vector(signed(A) sll to_integer(unsigned(B))) when ALUC ?= B"0011"
+         else std_logic_vector(signed(A) srl to_integer(unsigned(B))) when ALUC ?= B"0111"
+         else std_logic_vector(signed(A) sra to_integer(unsigned(B))) when ALUC ?= B"1111";
+    Z <= S ?= "00000000000000000000000000000000";
+end architecture;