I have not tried AOS4.x under WinUAE, but given that it runs effectively on a classic machine emulation - it was my understanding that OS4.x is restricted to 128MB of addressable ram as that is the limit on Amiga 4000 systems when using CyberstormPPC (or 256MB when using a BlizzardPPC on an A1200).
Any additional ram on a real machine was treated as a cache rather than additional physical memory available to OS4.
I am sure an OS4.x user may be able to shed some more light on this, but this was my understanding the last time I looked at threads on WinUAE PPC emulation and getting OS4 installed and running under it.
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thomas
Re: WinUAE 3.6.1 HELP! Posted on 8-Jun-2018 10:51:49