Once the code for Lisa’s operating system and applications is released next year, everyone will be able to tinker with it and try it out.

An appendix covers how to write your own operating system for RISC-V in about 1,000 lines of code. Don’t speak Japanese? An English version is available free on the Web and on GitHub.

The Apple Lisa, released in 1983, was one of the first personal computers to come equipped with a graphical user interface, and soon the operating ...