stopwatch features on calculators

[Dreato]

I want to mention that the HP45 has a stopwatch feature that was never commercialized. I modified my HP 45 to implement this feature, and replaced the calculator timing circuit with a MEMS oscillator. This machine now has timer accuracy of a few seconds in 24 hours, stores up to 9 split times etc. Complete info is on my website, http://www.davidreaton.com/hp-45. I recall there's lots of other info on these forums, too.

Regards,

Dave