It's no coincidence that one of the people responsible for helping design the 2600 went on to design the Amiga. Seeing the usefulness of changing color registers mid-screen, he invented the COPPER.
and than, it is interesting that Amiga coders did not use this trick until... ???
(I just want to say that limitation of ST hardware, and far better competition machine: Amiga, push ST coders to do really amazing stuff! so "emulation of Amiga" is not a necessary a bad thing
I bet that PCHG pictures looks better than HAM