Note: this is the first part of three articles about my experience building a 1980s Yugoslav 8-bit computer called the Galaksija. This part is mostly focused on the technical aspects of building this computer. Part II will focus on the history and the cultural impact of this machine. A BCS version of this article was published on RetroInfo. It is largely based on my sprawling Twitter thread about the Galaksija. At the start of the coronavirus pandemic, I unexpectedly took up an old hobby of mine...