Yes, the Teensy is in the battery compartment.
Gameboy gets its power from the Teensy by USB.
I don't have the precise links anymore, I think most of them are on instructables.
1 Jan 4, 2016 6:06 am
Re: Is there any integrated arduinoboy/teensyboy tutorial out there? (7 replies, posted in Nintendo Handhelds)
2 Jan 1, 2016 8:48 pm
Re: Is there any integrated arduinoboy/teensyboy tutorial out there? (7 replies, posted in Nintendo Handhelds)
I just finished one this week.
It has USBmidi via Teensy, backlight, inverted screen transparant Shell and 10 WS218 LEDs (Neopixels) built in.
You loose the battery compartment, but it is powered via USB.
Link port is removed and replaced by Mini-USB.
I don't have time to make a tutorial (nothing new either, followed existing tutorials), but I can make photos tomorrow.