You read that right. And yes, here it is running 2.9BSD. This is nothing short of amazing!
Read about Christopher Mills’s entry here:
And yes, the source has been stylized like a paper tape…
It really works best on a ‘real’ Unix like system. I’ve run it on Debian 9 & OS X 10.13.14 … It does consume 100% of a CPU core. But it’ll run a PDP-7 with v0 Unix, PDP-11 with Unix v6, and the aforementioned 2.9BSD. The Linux subsystem for Windows 10 didn’t handle the terminal control so well.
So, yeah kill your CPU and bask in the 4k glory!