[s3graham]

Super cool!

I'm not sure if they did a writeup for m8trix (a predecessor) but I tried dissecting it around when it came out (2014): https://scot.tg/2014/05/31/amazing-code-density/

[HellMood]

Howdy =) I didn't spot your analysis back then, but it's (still) spot on. A tiny addition, 0xA0000 to 0xB0000 is VGA memory when using graphics modes, so it's quite safe to write there until it flows into the visual text mode memory.