New blog post: In case you've ever wondered why Game Boy Advance boards have a 10 nF capacitor on the d-pad up input, but not on the other directions (left, right, down):

https://gekkio.fi/blog/2026/game-boy-advance-d-pad-capacitor-measurements/

Game Boy Advance d-pad capacitor measurements - gekkio.fi

@gekkio I shared your blogpost on bsky as well since I cannot tell if you're there and I know there's a sizable amount of people that would find it as interesting as I did.

Also, to help more people see this: #retrogaming #gba #nintendo #gameboy #gameboyadvance

@jay
I'm also on bsky as https://bsky.app/profile/gekkio.fi but in any case am grateful for sharing! I have a bad habit of dropping some useful information and then running away, hoping that people will find it 😅
Joonas Javanainen (@gekkio.fi)

Hands-on soft-/firm-/hard-/gate-ware consultant @ Merulogic Oy during the day, hardware research and emulators in evenings. Game Boys, Rust, husband, alopecia patient

Bluesky Social