What are those weird Fxxx and SMxxx files?
Those are most likely files produced by the Front Far East copier. Each such file has a 512-byte header (which you need to get rid of), an optional 512-byte trainer (which you probably want to retain), a ROM, and an optional VROM, all stuck together into a single file. Simply cut off the FFE header, add a .NES header, and modify it to reflect the correct number of pages, mapper type, etc. It is necessary to note that even those FFE ROM images which do not have a trainer were very often modified to work with the FFE copier. Although iNES has support for several types of FFE images, it is strongly recommended that you only use clean, unhacked ROM images backed directly from the cartridges you own, instead of FFE images. • What are the interleaved NES ROM images? Interleaved NES ROM image is a file which contains the ROM data in each even byte, and the VROM data in each odd byte. You will have to write a program to separate such file into ROM and VROM, and then glue them together with a .
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