The Ti 84 is the direct descendent of the 83 plus, which
came from the 83, 82 all the way back to 81.
By the time I got my TI-81, I already knew BASIC from learning on a
TRS-80. I used it make a few games,
including (from memory) a one/two player graphical tic-tac-toe, a number
guessing game, a text-based 9-hole golf game with semi-random holes and results,
and a game where you had to search a house to find colored keys to unlock colored
doors to find the bathroom before you pissed yourself. I made a few (teacher-approved) programs to
help me with homework and tests, too.
And, I documented each one …by hand…on notebook paper.