To whom it may concern; after writing the arm64 install73.img to a USB stick and booting from this, 7.3 boots and can run (at least in a tty-environment, which I am interested in) on Parallels 18 on a macOS M1 machine.
One thing to note, however: boot> set tty fb0 Or it will boot to a black screen (so write this to /etc/boot.conf after install). Kind regards + thanks, Tor Houghton