This is designed to be a simple set of questions and answers - please no general chit chat in here - keep it focused to help new users!
On this forum, all treads "Hardware" & "Software" in the menu, are the same for Spectrum Zx81, Zx80, QL, Z88,..
In the main board index.
It should be "Spectrum Hardware"... Zx81 Hardware".
We had to open the tread to see the parent section (in active topics).
Or deletes the Spectrum and other sections (and keep ZX81) to make it easy.