Assuming Charles meant a "real" computer -- not a human or slide rule -- then I bet the answer is some kind of analog computer. -----Original Message----- From: Fred Cisin <cisin at xenosoft.com> Subj: Re: Oldest operational computer was Re: cctalk Digest, Vol 54, Issue 23 Date: Wed Feb 13, 2008 7:31 pm Size: 173 bytes To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> On Wed, 13 Feb 2008, Charles H Dickman wrote: Meaningless question, until you DEFINE: "Oldest" "computer" "operational"