First computer with real-time clock?

On Wed, 28 Jul 2004, Marvin Johnston wrote: I'm thinking farther back. Was there any mini or mainframe that had a real-time clock built in or as an add-on option? It's come up in some litigation. The actual issue at hand is that someone was able to overturn a patent by claiming the IBM 650 had a real-time clock built in. They "proved" this by submitting as evidence a printout that had the date printed on it(!) I've checked the IBM 650 Manual of Operation and it makes no mention whatsoever of a real-time clock. I pretty much figured it wouldn't but I of course had to do due diligence. But it made me wonder: what was the first computer to have a built-in real-time clock? -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]