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diff --git a/lib/asn1/src/asn1_server.erl b/lib/asn1/src/asn1_server.erl
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+++ b/lib/asn1/src/asn1_server.erl
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+%% ``The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved via the world wide web at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%% 
+%%     $Id$
+%%
+
+%% Purpose: Provide complete encode/and pre-decode of asn1.
+-module(asn1_server).
+
+
+
+-behaviour(gen_server).
+
+-export([start_link/0,client_port/0]).
+
+%% Internal exports, call-back functions.
+-export([init/1,handle_call/3,handle_cast/2,handle_info/2,code_change/3,
+	 terminate/2]).
+
+
+%% Macros
+-define(port_names,
+	{ asn1_drv01, asn1_drv02, asn1_drv03, asn1_drv04,
+	  asn1_drv05, asn1_drv06, asn1_drv07, asn1_drv08,
+	  asn1_drv09, asn1_drv10, asn1_drv11, asn1_drv12,
+	  asn1_drv13, asn1_drv14, asn1_drv15, asn1_drv16 }).
+%%% --------------------------------------------------------
+%%% Interface Functions. 
+%%% --------------------------------------------------------
+
+start_link() ->
+    gen_server:start_link({local, asn1_server}, asn1_server, [], []).
+
+init([]) ->
+    process_flag(trap_exit, true),
+    erl_ddll:start(),
+    PrivDir = code:priv_dir(asn1),
+    LibDir1 = filename:join([PrivDir, "lib"]),
+    case erl_ddll:load_driver(LibDir1, asn1_erl_drv) of
+	ok -> ok;
+	{error,_} ->
+	    LibDir2 = 
+		filename:join(LibDir1, 
+			      erlang:system_info(system_architecture)),
+	    erl_ddll:load_driver(LibDir2, asn1_erl_drv)
+    end,
+    open_ports("asn1_erl_drv",size(?port_names)).
+
+open_ports(_,0) ->
+    {ok, []};
+open_ports(Cmd,N) ->   
+    Port = open_port({spawn, Cmd}, []),
+    %% check that driver is loaded, linked and working
+    case catch port_control(Port, 0, []) of
+	{'EXIT', _} ->
+	    {stop, nodriver};
+	_ ->
+	    register(element(N,?port_names), Port),
+	    open_ports(Cmd,N-1)
+    end.
+
+client_port() ->
+    element(erlang:system_info(scheduler_id) rem size(?port_names) + 1,
+	    ?port_names).
+
+
+%%% --------------------------------------------------------
+%%% The call-back functions.
+%%% --------------------------------------------------------
+
+handle_call(_, _, State) ->
+    {noreply, State}.
+
+handle_cast(_, State) ->
+    {noreply, State}.
+
+handle_info({'EXIT', Pid, _Reason}, State) when is_pid(Pid) ->
+    {noreply, State};
+
+handle_info({'EXIT', Port, Reason}, State) when is_port(Port) ->
+    {stop, {port_died, Reason}, State};
+handle_info(_, State) ->
+    {noreply, State}.
+
+code_change(_OldVsn, State, _Extra) ->
+    {ok, State}.
+
+terminate(_Reason, _State) ->
+    close_ports(size(?port_names)).
+
+close_ports(0) ->
+    ok;
+close_ports(N) ->   
+    element(N,?port_names) ! {self(), close}, %% almost same as port_close(Name)
+    close_ports(N-1).