Christine Dodrill - Blog - Contact - Resume | GraphViz - When Then Zen TempleOS is a public domain, open source (requires source code to boot) multitasking OS for amd64 processors without EFI support. It’s fully cooperatively multitasked and all code runs in Ring 0 . This means that system calls that normally require a context switch are just normal function calls. All ram is identity-mapped too, so sharing memory between tasks is as easy as passing a pointer. There’s a locking intrinsyc too. It has full documentation (with graphical diagrams) embedded directly in source code. This is outsider art. The artist of this art, Terry A. Davis (1969-2018, RIP), had very poor mental health before he was struck by a train and died. I hope he is at peace. However, in direct spite of this, I believe that TempleOS has immediately applicable lessons to teach about OS and compiler design....