PerlOS built in 1 hours: a hands-on guide to a homemade OS that boots into a Perl shell(zenn.dev)

- This is a hands-on article that teaches what happens between powering on a computer and text appearing on the screen, by building a small operating system yourself. The author is Zenn writer takesako. - The exercise starts in QEMU (an emulator that imitates a CPU and peripherals in software). You control the serial communication device (UART) directly to print characters, and write printf and malloc by hand. - The final goal is to load microperl, a Perl interpreter for embedded use, and build PerlOS, which boots into a Perl shell. After that, you build it for real hardware on the Raspberry Pi Pico 2. - The real hardware version has little RAM, so reportedly Perl's numeric type is changed from double to float and malloc is improved. The provided text ends at the introduction of exercise 7, so the later steps are not confirmed.