4 bits no mods redstone CPU

A 4-bit CPU made entirely of redstone, trying not to use complex circuits (except the counter), just torches and repeaters. It's not very fast, but changing the tick rate makes it quite interesting. It's good for those who want to learn more about digital logic, or even computer engineering, or just to play around.
It only took me a few days to make it, but 80% of it was done in one night, the rest of the days were spent studying how to make a counter, and the rest of the time was spent trying to fix bugs (it was just the rendering settings that were low).