Re^2: New-to-Perl: recommendations for windows setup? and the linked thread explain my transition but, like you, I used AS for a long time. The first or second London Raspberry Jam had a demo of RiscOS on the Pi and, since reading https://hothardware.com/news/raspberry-pi-microsoft-repository-phones-home-added-pi-os, I have been investigating alternatives to whatever the new official name for Raspbian now is. I understand that there is a "pure" Debian available and, if that allows 64 bit, I will be very interested, even though all the Pis I use are version 1 with 256 or 512Mb. There is certainly a Pi version of Ubuntu available, but https://www.theregister.com/2021/02/11/azure_ubuntu_data_sharing/ scares me. Debian (again AIUI) is in a code freeze before a major upgrade, so I shall wait before making critical decisions.