The PL/0 compiler, compiled by the Pascal compiler, doing its thing on CP/M
This video shows the Pascal compiler building a very old version old itself, from when it was much smaller and just a PL/0 compiler. The resulting binary, along with its runtime library and a couple of examples, is then transferred to the Next and used there. The PL/0 compiler prints the source code while processing it, which leaves an impression of performance (spoiler: not stellar, but also not catastrophic, and there is a lot of potential for optimization). The assembly phase needs to be invoked manually. I chose to use the SLR assembler.