GEN

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.

Genesis 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-genesis-rom/src/main.rs (297 lines) and plugin.json. No unit tests or tests/samples.rs, and the corpus has no .gen, .smd, .bin-genesis and .md-genesis sample. Covers .gen, .smd, .bin-genesis and .md-genesis. The card decodes the header at 0x100–0x1FF after checking the SEGA system name: domestic and overseas names, copyright, serial, region (decoded), I/O devices (decoded), ROM and RAM ranges, backup RAM, and verifies the checksum over the ROM after the header. 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, graphics or sound
• Interleaved .smd dumps (a 512-byte copier header and interleaved blocks) are not de-interleaved, so they fail the SEGA check although .smd is routed here (judgement from the code)
• Modem information and the memo field are not shown
• Files over 32 MiB are cut (flagged)

Libraries

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

• MioROM (candidate; MIT; Python; https://github.com/MiokoTech/miorom) — ROM hacking library; README platform matrix lists Sega Genesis/Mega Drive (.md/.bin/.smd, 68000 header, checksum). It does not list .gen explicitly and the depth of header parsing is unverified.

Sources

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