Guten Morgen, professor Walter,Walter wrote: ↑Sun May 12, 2019 6:28 amBom dia Jose, y muito obrigado for pointing to your comprehensive investigation. I admit I've read it a year ago but didn't remember. BTW, please note you called the quartz a "high precision crystal" in your post of 2018-02-11 and didn't relativize this statement any later AFAICS.
My bad calling it as "high precision".
I can't remember where i got that from, most probably from some optimistic datasheet.
I will have to search it again to do an update.
By the way, i was reading the Swissmicros adverts and the online user guide and i could not find references to a RTC feature. However the DM42 features date and time settings, so i agree with you that it should not exhibit several minutes time drift per year.
I am sure someone associated with Swissmicros will have a logical explanation for this.
Also i can not assume that all the DM42 machines are using the same type of crystal as seen in the picture that i used as reference.
Generalizations can be dangerous...