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Roughly 30 years after its birth at UK's Acorn Computers, RISC OS 5 is going open source

YARR
Boffin

All processes had to be written as position independent code that could sit anywhere in memory

Are you sure about that? I thought this applied only to relocatable modules, not application tasks which ran in user mode? IIRC the MEMC presented the memory pages allocated to a task as a fixed address space, protected from other tasks. Only relocatable modules run in a privileged mode / ring with access to the full physical address space.

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