function  show8505a
  figure('numbertitle','off','menubar','none');
  try
      image(imread('8505a.jpg'));
      set(gca,'xtickmode','manual','ytickmode','manual');  % remove ticks and labels
      title('HP 8505A RF Network Analyzer Controlled with MATLAB Instrument Control Toolbox')
  catch
      clc
      disp('cannot locate imread.m function or the 8505a.jpg file'); % the likely causes for failure 
  end;