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Nes — Rom Size

Without these mappers, games like The Legend of Zelda (128 KB PRG) or Super Mario Bros. 3 (256 KB PRG) could not exist. When a physical NES cartridge is dumped for emulation, it is stored as a .nes file (iNES format). This file includes a 16-byte header followed by interleaved PRG and CHR data. iNES Header Fields Relevant to Size | Byte Offset | Field | Meaning | | :--- | :--- | :--- | | 4 | PRG-ROM size | Number of 16 KB PRG banks | | 5 | CHR-ROM size | Number of 8 KB CHR banks | | 6 | Mapper & mirroring | Determines banking hardware | Calculating .NES File Size File Size = 16 bytes (header) + (PRG_banks × 16384) + (CHR_banks × 8192)

Without these mappers, games like The Legend of Zelda (128 KB PRG) or Super Mario Bros. 3 (256 KB PRG) could not exist. When a physical NES cartridge is dumped for emulation, it is stored as a .nes file (iNES format). This file includes a 16-byte header followed by interleaved PRG and CHR data. iNES Header Fields Relevant to Size | Byte Offset | Field | Meaning | | :--- | :--- | :--- | | 4 | PRG-ROM size | Number of 16 KB PRG banks | | 5 | CHR-ROM size | Number of 8 KB CHR banks | | 6 | Mapper & mirroring | Determines banking hardware | Calculating .NES File Size File Size = 16 bytes (header) + (PRG_banks × 16384) + (CHR_banks × 8192)