Reminds me of digital organizers from the 90's. I still have a working TI PS-6700, which my father used back then. I replace the battery once in in a while to k

Reminds me of digital organizers from the 90's. I still have a working TI PS-6700, which my father used back then. I replace the battery once in in a while to keep the data. Meanwhile it has an uptime of almost 30 years.