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I spent two hours probing. I found a 12MHz crystal (USB full-speed hint). I found pin 23 wiggling when I pressed Start (likely a matrix column). Finally, I shorted two test pads near the battery connector. The controller suddenly enumerated as "WCH.CN" in Windows Device Manager.
And for those willing to probe, log, and guess? That’s not a dead end. That’s a treasure map. controller part-number unknown chip genius
Drop your best "unknown chip" war story in the comments below. Did a logic analyzer save your day? Or did a hot-air gun reveal a hidden laser mark? I spent two hours probing
Does the chip have a crystal oscillator (two little silver cans nearby)? Yes? That suggests USB or RF timing. No crystal? It’s using an internal RC oscillator—cheap and simple. Does it route directly to a joystick potentiometer? Then you’ve found the ADC pins. Map the functions, and you reverse-engineer the role of the chip, even without the datasheet. Finally, I shorted two test pads near the battery connector