Since I started getting into Astrocade homebrew dev, I've been thinking about making a little dev cart so I can test my ROMs on real hardware. Well, a few months later, here's the result: Astrocart! It supports a 512KB flash ROM chip, which is bankswitchable with the switches at the left. It's also socketed so you can easily pull it out, reburn, and reseat as needed.
As for the magic... well, I believe that beautiful electronics are pleasant to use and share with friends. I designed the board with a galaxy of gold and white stars to help make homebrew development all the more fun and magical.
Many thanks are owed to my friend @batslyadams, who did a fantastic job with all PCB routing and general Eagle wizardry.
As of right now, this is the only fully assembled Astrocart in existence, but, y'know, maybe more to come.