Prompted by a recent GB paint program demo, taking a lil detour to try hooking a #SNES Mouse directly up to #GameBoy (snes controller protocol over link port).
Commited a few crimes with the latch and clock polarity (signal inverter not here yet), but it still manages to ~work on a DMG.
The paint program demo in question:
https://www.nikolaidelhaize.com/gameboypainter.html
Video of a Super Nintendo (SNES) Mouse connected to a Game Boy over Link Port being used to draw the words "SNES Mouse" and then a smiley face on the Game Boy screen