@grishka No, no, it’s easier to do setups like the Commodore 128 when you have to use only one chip!
So one of the architectures could maybe run CP/M!
(The C=128 had two processors, a MOS 8502 and a Z80, and could run in three modes, one of them being CP/M on the Z80. Not sure if that kind of setup would be useful now.)
Orz, interesting. I know that some consoles did a similar thing, they basically contained the entire previous-generation console either in the SoC or as a separate chip. PS2 and Game Boy Advance definitely did that. Sega Mega Drive as well, iirc.