> In this case I think it's the limitations of the NES itself that led to the mappers doing so much more externally Agreed. The Game Boy's ability to generate

> In this case I think it's the limitations of the NES itself that led to the mappers doing so much more externally Agreed. The Game Boy's ability to generate interrupts at various times in the scanline, and access to the current scanline number, make timing things with vanilla hardware much easier on the Game Boy than the NES.