The following text was written by Piru on Blueberry's No-CPU Challenge Github (https://github.com/askeksa/NoCpuChallenge/issues/1)
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Here's a writeup of a small nocpu intro I released on mastodon in June 2024: https://infosec.exchange/@harrysintonen/112627238742582618
Bootable ADF is here: https://sintonen.fi/bin/piru-copturing.adf
I think it does tick all the boxes for nocpu demo, even though it predates this challenge (and thus doesn't use the runner.S). For additional flare It also wipes the whole memory of any 68k code - the first blit will overwrite the code that starts the copperlist and does the stop instruction. Anyone inspecting the memory when the intro is running won't see any 68k instructions at all (except in the ROM).