(Not relevant to this demo in particular, just a piece of trivia I only learned in the past few years:) It makes sense to think of the TI-99 as part of the 8-bit microcomputer boom of the 1980s (Commodore 64, Apple II, TRS-80), but it actually had a 16-bit processor! (Which communicated with most of the rest of the computer through an 8-bit bus.)
https://en.wikipedia.org/wiki/Texas_Instruments_TI-99/4A#Fir...