http://www.ebay.com/itm/162498560049 Not mine, but if someone is looking for an in-circuit TTL logic comparator they might want to consider this...the Bugtrap comparator beats it hollow, but Bugtraps are hard to find! John :-#)# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist