On 20/11/2017 09:06, Jim GM4DHJ ... wrote:
anything DIGITAL only lasts a few years ...... if that...

I have a Sharp electronic organiser that has been in almost daily use
since I bought it in 1994. It never loses data - from battery backed RAM
memory and memory card - no flash memory then - and I haven't found a
single bug in the software, which hasn't been reset since I bought it.
And is powered by two AAA batteries that last six months.

--
Max Demian