A port of the disk version of Super Mario Bros. to the MMC1 mapper.
This patch can be retrieved from the link below:
Apply the patch to a clean Super Mario Bros. NES ROM. An example MD5 hash of the ROM needed is 811b027eaf99c2def7b933c5208636de.
You can use a BPS patcher such as https://www.marcrobledo.com/RomPatcher.js/ to apply the patch.
The source code compiles with asm6, provided in the repo. If using Windows, the provided batch file can compile automatically.