nesdev.org

NES: The master clock is 21.5 MHz, same as Super NES. The dot clock is 5.4 MHz, same as Super NES. The CPU takes multiples of twelve master clock cycles to do anything because of the divide-by-12 behavior of the clock regulator. (On Super NES, this is usually 6 or 8 depending on the address bus.) T...

Compared to Game Boy Color, Game Boy has no double-speed mode on its CPU (thus locked at 1.05 MHz instead of 2.1), half the video memory, and no DMA to VRAM. This cuts CHR RAM in half (384 unique tiles instead of 768) and removes the tilemaps' second plane. In addition, the display of the original ...