First computer with real-time clock?

On Thu, 2004-07-29 at 13:20, Vintage Computer Festival wrote: But but... this isn't an obvious statement, even... even 'stand-alone battery-backed chips producing BCD date & time in English' require interpretation (interface protocol, output, etc) schematically no different than the simplest timer tick, via interrupt or mainline code IO or memory poll (or hell HALT). Then there's light-to-dark-grey chips that produce isochronous events, even timedate specific, in all sorts of intermediate forms, seconds since FOO, etc. Every hardware programmer has coded dozens. I did one/many for CP/M (in my homemade command interpreter) and MSDOS, etc. Oh it's certain! Few things are more taken for granted but hard to pin down. My favorite on the opposite end, is a random bit stream produced by using the pulses from a geiger counter (and associated radioactive material) to clock a long shift register. It's well-discussed, but I'm not sure anyone ever produced one.