Absolutely incredible "Back to the PET" demo compo on physical hardware with amplified audio out.
The beginning of the demo is presented in "dark mode" being run and filmed from a real PET, which produces sensational tracers and ghosting effects "for free". Hearing the audio jacked up is super sweet as well.
Check this out:
The original demo was created by someone who goes by the moniker shiru8bit on a 1MHz 6502 microprocessor computer from 1977 packaged into a tiny little standalone 29KB "PRG" binary. Here is the original, as played and recorded via emulation.
PRG and source code (CC0) (scroll down to find it).