[TUHS] AOS and IBM/RT [Re: Amdahl UTS, AIX/370, AIX/ESA

Charles H Sauer sauer at technologists.com
Fri Nov 22 03:29:51 AEST 2019

On 11/21/2019 5:58 AM, Dan Cross wrote:
> On Thu, Nov 21, 2019, 1:33 AM Al Kossow <aek at bitsavers.org 
> <mailto:aek at bitsavers.org>> wrote:

>     It was, and may still be in the afs heirarchy
>     I'm not going to say where, or how complete what was there is
>     I also seem to remember it still sat on top of an AIX microkernel
>     and didn't go down to bare metal.
> No, that's not true. AOS was basically 4.3BSD Tahoe plus NFS and it ran 
> on bare RT hardware. There was source code available to universities, 
> though as I recall some bits related to memory management were missing 
> and distributed as object files. I gathered, at the time, this was due 
> to some obscure intellectual property reasons. People later tried to 
> Port e.g. 4.4BSD to aging RT hardware and found it challenging because 
> the memory subsystem was so different.
> But anyway, there was no hypervisor involved.

There may well have been AFS for AIX and thus the confusion about 
hypervisor (AIX VRM).

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