If you grew up using an Apple II computer of some flavor, likely you have fond memories of playing games like Karateka, Oregon Trail, or other fun and/or educational titles. perhaps you never considered it at the time, but how neat would if have been if one those computers could be transported to whatever location you desired to be used without external power?
Chris Larkin, a California-based software engineer, decided to take on this challenge (see his GitHub writeup) using already designed 3D print file of the Apple II computer (base, monitor), and added his own custom bracket for a CHIP computer. This computer emulates an Apple II using LinApple-Pi software. The resulting build is an extremely small version of an Apple II computer that looks strikingly like a tiny version of the original (or at least one iteration of this system).
Power for this setup is provided by a high capacity 12 volt “drone” battery, which Larkin estimates will give him about 10 hours of use between charges. Deciding on this setup was a bit of a challenge, as the monitor required 12 volts, and the CHIP can only handle about 5. Originally he tried to use a 3.6 volt boost converter to power both, but this only gave about an hour of battery life and ran hot. In the end, he ended up instead stepping down this 12 volt power with a buck converter to power the CHIP.
Once you dig a little further into the build, there are a few things you might not expect on an Apple II, including a composite video socket on the…