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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_to_natural.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_to_natural.vhd
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+
+-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs is free software; you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License as published by the
+-- Free Software Foundation; either version 2 of the License, or (at
+-- your option) any later version. 
+
+-- VESTs is distributed in the hope that it will be useful, but WITHOUT
+-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+-- FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+-- for more details. 
+
+-- You should have received a copy of the GNU General Public License
+-- along with VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+entity bv_to_natural is
+end entity bv_to_natural;
+
+
+
+architecture test of bv_to_natural is
+
+  -- code from book
+
+  function bv_to_natural ( bv : in bit_vector ) return natural is
+    variable result : natural := 0;
+  begin
+    for index in bv'range loop
+      result := result * 2 + bit'pos(bv(index));
+    end loop;
+    return result;
+  end function bv_to_natural;
+
+  -- end code from book
+
+  signal data : bit_vector(0 to 7);
+  constant address : bit_vector(0 to 3) := "0101";
+  constant Taccess : delay_length := 80 ns;
+
+begin
+
+  tester : process is
+
+    constant rom_size : natural := 8;
+    constant word_size : natural := 8;
+
+    -- code from book (in text)
+
+    type rom_array is array (natural range 0 to rom_size-1)
+                        of bit_vector(0 to word_size-1);
+    variable rom_data : rom_array;
+
+    -- end code from book
+
+  begin
+
+    rom_data := (X"00", X"01", X"02", X"03", X"04", X"05", X"06", X"07");
+
+    -- code from book (in text)
+
+    data <= rom_data ( bv_to_natural(address) ) after Taccess;
+
+    -- end code from book
+
+    wait;
+  end process tester;
+
+end architecture test;