The past couple days I've been playing NES Megaman 1, 2 and 3 - from beginning to end, while recording in fbneo.
Came across a bug in Megaman 3, the bug happens in Gemini Man's level, and during the "decoy" endboss fight. The pause menu (weapon-select) becomes distorted (see picture, below).
After digging into the code for a few hours, it's fixed

note: that glitchy menu-outline on the good picture below is actually normal (on hw, does the same thing - a game "feature")
best regards,
- dink