The methods in the article emulate hardware-managed tiles (https://www.nesdev.org/wiki/PPU https://www.nesdev.org/wiki/PPU seems a good starting point for the N

The methods in the article emulate hardware-managed tiles (https://www.nesdev.org/wiki/PPU https://www.nesdev.org/wiki/PPU seems a good starting point for the NES) in software, using a frame buffer of independent pixels: the challenge is adapting a sideways scrolling game engine to look good in a completely different system's memory space and bandwidth limitations, not "figuring out how to do sideways scrolling" per se.