Active ISDN-Controller ISA card with 20 MHz Transputer
<a href="//commons.wikimedia.org/wiki/User:Hippie2000" title="User:Hippie2000">Hippie2000</a>
CC BY-SA 3.0
Created for the <a rel="nofollow" class="external text" href="http://wehavemorefun.de/fritzbox/index.php/ISDN-Controller_B1">ISDN-Controller B1</a> page of the german <a rel="nofollow" class="external text" href="http://wehavemorefun.de/fritzbox/index.php/AVM_Wiki">AVM research Wiki</a>, uploaded by its author. TIFF version available on request.