[UPDATE] silkscreen and the upside-down side of things
An after midnight board, how classic [don't] [just] [don't]. I could have breadboarded this as well first, to check if it actually works. Damn. Now I'm hesitant to reorder, I should try it first. - Wait, what am I talking about?
This is a shield for the Wemos D1 mini, that features a TXB104D, a level-shifter with auto detection for direction. The picture seen here is the corrected version, after ordering the failed PCB. By accident I've mirrored the game boy connecter, because I tried to rotate it in my head. This version has numbered pins, to make it more easy to check. Otherwise I'm pretty proud of it. I can still use it as a breakout board for the TXB104D and check if the connector gets a clean cutout, even use the Wemos D1 mini to talk to 5V stuff.
There are "rumours" that the ESP is 5V tolerant and the Game Boy might be happy with 3V3 volts of the ESP, but I'm not eager to try. By rumours I mean, I thought I have read that somewhere.
Here is that ear worm you're trying to get rid off. Gremlins and ear worms, classic Dave.