An archive of interesting publications that include things other than games and some very in depth science and maths publications amongst them, such as this for example...
https://archive.org/details/science-eng ... clair-1000
The archive can be found here...
My website (timexsinclair.com) indexes all that stuff, too.
Speccy: 48k, +, +2, +3, TS2068, "Bare Metal" Pi, Next KS2, IF1/Microdrives/Vdrive/Light Gun/VGA-Joy
QL: Minerva/QL-VGA/Custom PSU
C5: 24v, LiFE, Disc brakes