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==Get the ROM / ISO==
You need to read the readme included with the patch to know what ROM version you exactly need:
* '''The game name'''* '''The region: ''' Japanese, US, Europe...* '''The revision'''* '''The dump: ''' [!] means good dump, but you can get a No-Intro dump for that.
Either download it off a search engine, or dump it yourself if you can.
===NES Games===Considering iNES headers are needed for emulation, you might want to look for NES ROMs including them (aka most regular NES ones, but not your personal dumps assuming you go through such trouble). ===SNES Games and headers===In the case early days of SNES gamesemulation, headers were appended to SNES roms to help the emulator doing what it should do. However in these days they're not needed, and hence aren't expected to be included in ROMs nowadays. The patch needs to be either on rom a headered ROM (with a header ) or a headerless ROM (without a header). You can convert a given rom between both states with the tush utilityReadme file should clarify this. In case the readme doesnIt't tell which one s really important, because if you need to haveget it wrong, you can tell if the patch is applied and corrupts everything in-game. Keep a backup ROM and try applying the patch on a headered ROM then an unheadered ROM. You can change whether the ROM is headered or not using [http://www.romhacking.net/utilities/608/ the tush utility].
==Apply the Patch==
Applying the patches sometimes result, if the patch author isn't careful enough (which is often the case) in the checksum being wrong. While in the case of SNES games this isn't really a problem with emulators, MD/GEN games will crash to a red screen.
To fix the checksum of MD/GEN ROMS, use [http://www.romhacking.net/utilities/342/ this tool]. You can also fix SNES checksums if you so wish but it doesn't make a difference in emulators.
