One of the more recent handbooks (as far as the ST/E/TT/Falcon's commerical lifetime is concerned), it has a wealth of information about the system for programmers.ย

As shown in the cover picture, it is split into chapters that cover all the subsystems like BIOS, XBIOS, GEMDOS, AES, VDI, etc., even covering early MiNT and MultiTOS versions.
The appendices also contain a massive amount of data, especially all the system calls, which are always handy to have when writing applications that use the system.
An absolute must for Atari programmers!
๐Read the HTML version online
๐Download the CD (PDF/HTML) version. Not a direct link, but you can search and download
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Comments
Developpers will preferย https://freemint.github.io/tos.hyp/en/index.html
And BTW I still have the STG sources, so it is not a problem to fix the errors.