fullsnes

Fullsnes is a large hardware reference for the SNES created by nocash with several ascii art illustrations.

In https://problemkaputt.de/fullsnes.htm#snescartridgecicnotes, the formula for the Polynomial Counter is missing an inversion in the second term.
In https://problemkaputt.de/fullsnes.htm#snesapuspc700ioports, it could be clearer that bits 0-3 of TnOUT are reset to 0 automatically by hardware after reading - it is not the programmer's responsibility to zero them after reading. [1]
In https://problemkaputt.de/fullsnes.htm#snesapudspvolumeregisters, MVOL should stand for "main volume," not "master volume" because MVOL does not control the echo volume, and "Main Volume" is how the official docs expand "MVOL." [2]
In https://problemkaputt.de/fullsnes.htm#snescartridgeromimageinterleave, the worst case scenario can much worse than triple-interleaved or double-mis-de-interleaved - in fact ten interleavings of a normal 320Kbyte file is the identity operation, so in this particular case the worst is quintuple-interleaved.