When taking damage, you no longer lose your Mega Buster charge.
This is a port of an existing hack for Rockman 5 to the North American version.
Database match: Mega Man 5 (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: CFE3B9A0D70F36E5D77C2DF353432C6042929B1E
File CRC32: BD918F62
ROM SHA-1: 36842491BB513C80BEB9F2FB2AA30EDAA1121CA4
ROM CRC32: 3EDCF7E8