Good memories! Not a small number of hours was spent reading TUTnn.txt files in the 90s. Learned a lot. Another great series at the time was the pcgpe (pc game programmers encyclopedia) which was mentioned in the VGA trainer docs (or was it the other way around?).
Now this brings back memories!
I learnt assembly and graphics programming from this in the 90s.
That was my bible back in the days, together with PC-GPE! As i remember there was a phone number in one of the files, and one day when i came home from school and my dad wasn't home, i secretly used our phone to make an international phone call to it. I had no idea what to say, so i just hung up as soon as the person on the other end answered!? :) Just hearing the voice of my idol was cool enough i guess.