Repositories All sources for steckOS, BIOS, firmware, decoder and also schematics and layouts can be found in our repositories at All software (steckOS, BIOS, libraries, tools, games, stuff): Hardware (Schematics, PCB Layouts): Steckschwein Emulator: Tools We almost exclusively use Open Source-Software to design and code for the Steckschwein. cc65 Extensive suite of cross development tools for almost every 6502 based platform. We mostly use ca65 because of the linker.