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BBC basic on this platform was amazing, inline assembly, SWI & SYS calls made calling firmware & inline assembly programming a breeze. Mapping memory and registers to basic variables was trivial. Such a nice programming experience.

I recall a few years ago writing a BBC basic program under Riscos that used the Raspberry Pi's BCM2835 undocumented random number generator - no problems. You can see how simple the source code is here:

https://www.riscosopen.org/forum/forums/11/topics/15091