Mmm,. TinyPTC is so tiny
that there was no need for documentation (Though I'd write a simple documentation just for the sake of it if I was in the author's place). There are only three functions and the tptc example you get when downloading the package, uses all of them. Though through the header files of tptc you can do other things like change from fullscreen to windowed mode and more that maybe should be documented.
TPTC is fun! And I've noticed improvement of output speed in some PCs over SDL (but in some exactly the opposite ;P) due to fast MMX vram blitting routines. Though I use SDL for most of my projects now because it offer controls, sound, more graphics options (TPTC only supports 32bit color while SDL from 8bit to 32bit, though I only use 32bit color anyways
), much more helpfull functions to work for a complete game project for example. TPTC is great for doing a demo I think! (Still, even in demos I prefered SDL
)
Anyways, I haven't found much documentation rather than I figured out all myself about the three functions from the example and the readme.txt.
