Is seems that my good old SGI O2 just died. I tried to replace the RTC
chip (and probably did it correctly). But after some time the O2 ceased
to boot and end with blinking orange light. IT should be a RAM error
but I tried several combinations of RAM and nothing changed...
It was expected development as this system was 22 years old ad if was
used daily until 2019. But still, it made me sad.
