Even though I was impressed with the original article (so kind of contrary to the author) in the meantime I tried the same thing with Claude Sonnet 4 (because some people here criticized the approach due to not using a proper "coding model") and got no better results. Now I tried about a dozen iterations but it did not manage to create a "BASIC programm for Atari 800XL that makes use of display list interrupts to draw rainbow-like colored horizontal stripes", although this is like a "hello world" for that technique and there should be plenty of samples on the Internet. I am curious to see if anyone can make that work with an LLM.