diff --git a/algorithms/basic_logic.bf b/algorithms/basic_logic.bf
index 48f7b25..5ced76c 100644
--- a/algorithms/basic_logic.bf
+++ b/algorithms/basic_logic.bf
@@ -1,4 +1,9 @@
 Endless loop
 Affect: cell(ptr)
 
-+[ >< ]
++[]
+
+If clause
+Affects: cell(ptr); ???
+
+[ do stuff here [-] ]
diff --git a/fpga/src/cellMemory.vhd b/fpga/src/cellMemory.vhd
index 4ce7488..d6b7e40 100644
--- a/fpga/src/cellMemory.vhd
+++ b/fpga/src/cellMemory.vhd
@@ -22,7 +22,7 @@ end cellblock;
 
 -- Architecture arch of cellblock: read on every clock cycle to cell.
 architecture arch of cellblock is
-    type empty is array(0 to 65536) of std_logic_vector(7 downto 0);
+    type empty is array(0 to 65535) of std_logic_vector(7 downto 0);
 
     signal memory : empty := (others => (others => '0'));
 
diff --git a/fpga/tb/tb_bfpu.vhd b/fpga/tb/tb_bfpu.vhd
new file mode 100644
index 0000000..5b81fad
--- /dev/null
+++ b/fpga/tb/tb_bfpu.vhd
@@ -0,0 +1,57 @@
+-- tb_bfpu
+-- 2023-10-04
+-- Author: Yannick Reiß
+-- E-Mail: yannick.reiss@protonmail.ch
+-- Copyright: MIT
+-- Content: Entity tb_bfpu - Run bfpu for testbench.
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+library std;
+use std.textio.all;
+
+entity bfpu_tb is
+end bfpu_tb;
+
+architecture implementation of bfpu_tb is
+
+    -- input
+    signal clk      :   std_logic;
+    signal sw       :   std_logic_vector(7 downto 0);
+
+    -- output
+    signal debug    :   std_logic_vector(7 downto 0);
+    signal led      :   std_logic_vector(7 downto 0);
+    
+    constant clk_period : time := 10 ns;
+
+begin
+
+    uut : entity bfpu
+        port map (
+            clk     =>  clk,
+            sw      =>  sw,
+            debug   =>  debug,
+            led     =>  led);
+
+    -- Clock process definitions
+    clk_process :   process
+    begin
+        clk <= '0';
+        wait for clk_period / 2;
+        clk <= '1';
+        wait for clk_period / 2;
+    end process;
+
+    -- Process stim_proc
+    stim_proc : process
+        variable lineBuffer : line;
+    begin
+        write(lineBuffer, string'("Start the simulator"));
+        writeline(output, lineBuffer);
+
+        wait;
+    end process;
+
+end implementation ; -- implementation
\ No newline at end of file