NES

Generated by scripts/gen-format-pages.py from docs/data/format-metadata/, FILE_FORMATS.csv and docs/formats-master.csv. Do not edit by hand: change the source, then run the script.

NES ROM Preview.

At a glance

How much Poka reads

B4 Summary. The container and metadata are read and summarised (counts, properties, structure), but the main content is not rendered.

Confidence: medium (the reviewer read the code). Basis: Reviewed 2026-10-26: read parsers/poka-nes-rom/src/main.rs (272 lines) and plugin.json. No unit tests or tests/samples.rs, and the corpus has no .nes, .unif and .nes2 sample. Covers .nes, .unif and .nes2. The card decodes the 16-byte header: iNES or NES 2.0, mapper (named for common mappers), mirroring, battery, trainer, VS System and PlayChoice-10, PRG and CHR sizes, and for NES 2.0 the submapper, PRG RAM and NVRAM sizes and the TV system. Judgement: B4 rather than B5, because the whole header is decoded and checked; nothing of the ROM content (code, graphics, sound) is.

What Poka does not read

• ROM content is not decoded: no code, CHR tiles or graphics
• UNIF files (.unif) are refused: they have their own magic, which this module does not read, although .unif is routed here
• NES 2.0: the high bits of the PRG and CHR sizes, CHR RAM sizes, console type, miscellaneous ROMs and the default expansion device are not read
• The trainer contents are not shown
• The file size stops counting at 16 MiB

Libraries

Libraries Poka uses or has assessed for this format, with the status, licence and language the registry records.

• ines (candidate; MIT; Rust; https://lib.rs/crates/ines) — Reads and writes iNES ROMs; version 0.3.0 (Feb 2023); repository on GitLab (gridbugs/mos6502).
• nes_rom (candidate; MIT; Rust; https://lib.rs/crates/nes_rom) — Parses iNES, UNIF and FDS files with basic validation; single unstable release 0.1.0 from April 2019.

Sources

• parsers/poka-nes-rom/src/main.rs
• parsers/poka-nes-rom/plugin.json