To understand the mechanics of the game, the ROM source was explored. Since the NES was based of the MOS 6502 microprocessor, this involves looking at the 6502 assembly. The article details how ...

To play games that appeared on different consoles ... code of one piece of software and use it to develop something else — of FCE Ultra, a previous NES emulator. This means that it combines different ...

Even if extracting NES game data is not your thing, the emulator concept [Matthew] uses might be still worth a read. On the other hand, if you want to dig deeper into the NES, you should ...

Remember, these games aren't individual downloads but are bundled together in the Nintendo Switch Online NES, SNES, GB, N64, Genesis / Mega Drive, and GBA applications, which are 'free' to download.

Beyond NES games themselves being old ... These are streamed rather than squirting ROMs to your device, meaning you use oodles of bandwidth to play a game whose original binary was smaller than a JPEG ...