Manuel Fuchs shares what he learned by taking on a very unusual Elm project: a Nintendo Game Boy emulator! Thank you to our sponsors, [Ellie](https://ellie-app.com), [Culture Amp](https://cultureamp.com/jobs) and [Joel Clermont](https://twitter.com/jclermont). Special thanks to Xavier Ho ([@Xavier_Ho](https://twitter.com/Xavier_Ho)) for editing and production of this episode! **Recording date:** 2018-11-10 ## Guests * Manuel Fuchs ([@malax](https://twitter.com/@malax)) ## Show Notes 00:00 **Show opening** 01:58 **Manuel's journey to Elm** 07:09 **Why a Game Boy emulator** - [Tetris Effect](https://www.tetriseffect.game) - video: [Writing a Game Boy Emulator in Ruby](https://www.youtube.com/watch?v=WbO2FEpNPvQ) 12:19 **False assumptions and unexpected difficulties** 18:37 **Loading Game Boy ROM images as binary data** 19:59 **Breaking out of the Elm Architecture** 22:30 **Implementing a CPU instruction set in Elm** - [Elmboy source code](https://github.com/Malax/elmboy) 25:46 **Debugging and profiling** 27:03 **Throwing out types** 31:49 **Adding Pokemon compatibility** 33:30 **Readability, teaching and welcoming contributors** 34:57 **More performance optimisations** 41:05 **Elm + Game Boy = fun** - [Try Elmboy](https://malax.github.io/elmboy/)