Nelsonic Star Fox, Sean decapped it a few years ago, but ROM layout wasn't figured out until now.
It also has an extra sound effect chip, similar to other electronic toys (eg. Executor keychain). That one is not emulated, it is used for 3 sound effects in Star Fox:
- player ship moves
- enemy explodes
- player drops bomb

basic background artwork for MAME: https://tsk-tsk.net/net/extart/

[Linked Image from i.imgur.com]