- Sachen MMC1/MMC2 multicarts (the 4B-xxx 4-in-1 collections and the Rocket Games two-in-one carts) get a mapper with the base/mask/bank register scheme: the switchable window's bank is (base & mask) | (bank & ~mask), the fixed window maps the base bank. Detected by their scrambled boot logo (MMC2 carts hide a valid CGB half-logo at a later bank's header, which is also their power-on base bank). The real cart's header-descrambling lockout is not modelled; the boot falls back to the post-boot presets. 4 more of the 8 attached 4B collections now reach their menus and play (issues #73/#74/#75). - An unknown cartridge-type byte (Pocket Voice's 0xBE and friends) falls back to MBC5 banking instead of refusing to load; Pocket Voice V2.0 now boots to its recorder UI (issue #71). - The Wisdom Tree heuristic no longer grabs type-0 dumps under 128 KB: those are treated as plain 32 KB ROMs like on hardware (issue #76). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J1wLWscyUGS7CFwc3CjJR8

Pocket Voice V2.0 (Unl) [C].gbc fails to load #71

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