On 2019-12-12, Martin Gregorie  wrote:
> Does anybody know whether OS-9 has been ported to an RPi?
>
> It claims ARMv5 and ARMv7 support, but thats all I can find on its main
> site. Its certainly light weight: its original release supported multi-
> tasking on a 64KB 6809. I ran it for some years on a 68020 where it was
> stable, reliable and amazingly bug-free.

It says "in work" - whatever that means (there is also reference on
official microware page but in some embedded pdf/whatever format)...

https://microsys.de/products/microware-os-9/microwaretm-os-9-for-arm/

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obruT

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