Hi once again In another discussions a question got born, which nobody had exact answer f= or. Looks like even on modern motherboards RTC clocks still are using same 32768Hz resonators, which are usually quite big. What is the reason not to use higher frequencies which are used everywhere else? Do those slower resonators have any advantage? --=20 KPL --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .