@HN ... development began in 2003, after Davis had a series of manic episodes that left him hospitalized for mental health. Diagnosed as schizophrenic, he proclaimed that he had "communications" with God, telling him the OS he built was for God's third temple.
He said TempleOS is of divine intellect due to the inspired nature of the code, and that God said to create the os with 640x480, 16 colors display and a single audio voice. He wrote a language for this called "HolyC" in C and C++.