Reading about fantasy consoles on Twitter led me to some sites about sizecoding and the demoscene, which I wasn’t familiar with.
SizeCoding.org is a wiki dedicated to the art of creating very tiny programs for the 80x86 family of CPUs. By “very tiny programs”, we mean programs that are 256 bytes or less in size , typically created by members of the demoscene as a show of programming skill. The size of these tiny programs is measured by their total size in opcode bytes, and are usually presented as executable .COM files to be run in pure DOS, a DOS VM running inside another operating system, or an emulator that can run DOS such as DOSBox.
Here’s an article:
The demoscene is an international computer art subculture focused on producing demos: self-contained, sometimes extremely small, computer programs that produce audio-visual presentations. The purpose of a demo is to show off programming, visual art, and musical skills. Demos and other demoscene productions are shared at festivals known as demoparties, voted on by those who attend, and released online.