That were those days ...
To my surprise there are stil big sources:
Ira Goldklang's TRS-80 Revived Site
This is the most detailed source of everything around TRS-80 that I know, and it's alive.
Here you find informations about technic, software, emulators, shipping, conversion of data storage, ...
And you can find even other sites. So feel free to dive into the past.
A Tribute to the Dick Smith System 80 (aka Video Genie and PMC-80/81)
The *HUMONGOUS* TRS-80 Archives
TRS-80 Disk Software Page
TRS-80 Manuals and Documents
Programming in BASIC on the TRS-80
So I took the dust from my old Model III and started working ...
And as things got on, I also powered up my old Modell I to start working ...