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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/ball.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/ball.vhd
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+++ b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/ball.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 
+
+library ieee_proposed;  use ieee_proposed.mechanical_systems.all;
+                        
+entity ball is
+end entity ball;
+
+----------------------------------------------------------------
+
+architecture bouncer of ball is
+  quantity v : velocity := 0.0;
+  quantity s : displacement := 10.0;
+  constant g : real := 9.81;
+  constant air_res : real := 0.1;
+begin
+  
+  if v'above(0.0) use
+    v'dot == -g - v**2*air_res;
+  else
+    v'dot == -g + v**2*air_res;
+  end use;
+        
+  reversal_tester : process is
+  begin
+    wait on s'above(0.0);
+    break v => -v when s < 0.0;
+  end process reversal_tester;
+        
+  s'dot == v;
+        
+end architecture bouncer;