First computer with real-time clock?

When I worked at Lockheed (as an IBM'er) in the early '60s we were tracking military satellites with 256 channels of data. We had a real time clock interfaced to an IBM 7094 to support timestamped tracking of the flight data. As I recollect, the satellite(s) themselves had a real time clock. Since this was a classified project I don't have any documentation to back up my recollections. The SAGE system from that era also used real time clocks. I suspect that the tracking computers for the Apollo missions had a similar setup to ours at Lockheed. I do have some of the listings of the Apollo onboard computer software - and I'd be very surprised not to find a real time clock being referenced. Lyle -- Lyle Bickley Bickley Consulting West Inc. http://bickleywest.com "Black holes are where God is dividing by zero"