There's a replacement motherboard which uses an FPGA in lieu of an original GB/GBC/SGB SoC, so you can in fact build a Gameboy of Theseus with zero Nintendo par

There's a replacement motherboard which uses an FPGA in lieu of an original GB/GBC/SGB SoC, so you can in fact build a Gameboy of Theseus with zero Nintendo parts. https://www.youtube.com/watch?v=Cesh5OAL4uk https://www.youtube.com/watch?v=Cesh5OAL4uk