anchor.diff:  
   -include("types.hrl").
   
  --record(state, {print=[time, space, direction, space, packet, nl, frame]}).
  +-record(state, {print=[time, space, direction, space, packet, nl, {hexblock, frame}]}).
   
   %%%===================================================================
   %%% gen_event callbacks
  
positive.code: %% API
  -export([attach/1
           ,change_format/2
          ]).
  
  %% gen_event callbacks
  
negative.code:     {Fmt ++ "~p", Args ++ [P]};
  format(frame, Info, {Fmt, Args}) ->
      F = proplists:get_value(raw, Info),
      {Fmt ++ "frame ~p", Args ++ [F]};
  format({hexblock, frame}, Info, {Fmt, Args}) ->
      F = proplists:get_value(raw, Info),
      {Fmt ++ "Frame:~n~s", Args ++ [hexblock(F)]}.
  
  %%--------------------------------------------------------------------
  %% @private
  