Romhack Thursday: Advanced NES Rom Utility

Edit the Frog would like you to know that he has no relationship with that meme frog going around.

On Romhack Thursdays, we bring you interesting items from the world of game modifications.

We’re starting another weekly feature on Set Side B, where we try to regularly bring you news on new romhacks and romhack-related items. Big websites sometimes seem like they try to appease publishers, whose good graces they rely upon for news and review copies, by not mentioning hacks too prominently, at least if they’re of console games. Whether this happens, or if it merely seems like it may happen, we don’t ask big publishers for review copies so we don’t have to avoid talking about them, and are free to tell you about the most interesting of these game edits that we can find.

To start us out though, something you’ll find you’ll need if you make heavy use of hacks, are good rom patchers. To shield themselves from legal liability, hack authors usually distribute their modifications through the use of patches, which are in essence lists of modifications that can be applied in an automated way to a source rom file, which you’ll have to source by some other means.

Two good such utilities are Floating IPS, which can apply IPS patches, and (the sadly departed) Near’s beat, which can apply BPS patch files. IPS is the most commonly-used utility, and functions mostly as a kind of binary diff, but it’s limited to source files of a maximum size of 16 megabytes, and doesn’t offer any error detection features, so if the file you’re patching isn’t exactly what the patch expects (which happens frequently, as bad dumps or headerless roms often turn up), not only will you end up with a corrupted file, but you won’t even have any indication something has gone wrong-in most cases, you’ll still be told the file patched successfully. BPS is a more intelligently-designed system, and has some error detection built-in.

A new utility that can be of use is “Advanced NES Rom Utility,” a program that can not only apply both IPS and BPS patches but several other types as well, and can also fix many common problems with NES dumps in particular, including fixing checksums and metadata. But patches are usually source platform agnostic, so you might get some use out of it even if NES romhacks are not interesting to you.

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