![]() 10: Flags 10 - TV system, PRG-RAM presence (unofficial, rarely used extension).9: Flags 9 - TV system (rarely used extension).8: Flags 8 - PRG-RAM size (rarely used extension).7: Flags 7 - Mapper, VS/Playchoice, NES 2.0.6: Flags 6 - Mapper, mirroring, battery, trainer.5: Size of CHR ROM in 8 KB units (Value 0 means the board uses CHR RAM).0-3: Constant $4E $45 $53 $1A ("NES" followed by MS-DOS end-of-file). ![]() Some ROM-Images additionally contain a 128-byte (or sometimes 127-byte) title at the end of the file. Pla圜hoice PROM, if present (16 bytes Data, 16 bytes CounterOut) (this is often missing, see PC10 ROM-Images for details).Pla圜hoice INST-ROM, if present (0 or 8192 bytes).CHR ROM data, if present (8192 * y bytes). ![]() nes file format could mean the iNES file format or NES 2.0 format, so the full format names should be used where the differences in the formats are relevant, like specifications or format support.Īn iNES file consists of the following sections, in order: Now that the NES 2.0 file format exists, which uses the same. nes, so it is sometimes referred to as the. This file format is commonly referred to as the iNES file format/iNES header format. Its most lasting contribution to the NES scene was its popularization of the iNES ROM file format and mapper numbering system. INES was an early NES emulator developed by Marat Fayzullin.
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