
Research Game Boy/Game Boy Color hardware details from Pan Docs first, with curl and mirror fallbacks, and SameBoy implementation only when specs are incomplete.
Create and update mapper verification ROMs in roms/automated_tests/mapper_verification using shared tests, per-mapper defs/configs, and specification-driven behavior.
Research NES/Famicom hardware details from NESdev first, with curl and mirror fallbacks, and Mesen implementation only when specs are incomplete.