A4000 setup possible ?

[amyren]

I suppose the easiest way to achieve this is to open up your A4000D and remove some fast memory chips

just kidding of course. I am still waiting for my unit to be shipped so I'm curious about how it all works.

But there might be another issue regarding emulating a A4000, the cpu.
According to the information at  github (BlitterStudio/amiberry/wiki/ information there are two amiberry versions available, Amiberry and Amyberry-Lite.
Lite is supposed to be used for slower hardware up to Pi4 speed, so I guess this is the version in use for the Orange Pi Zero 3 (A600GS)

From the wiki:
Cycle accurate for 68000 mode only, stripped down CPU emulation for other models. Models higher than 020 (030-040) don't use proper CPU cycles, they are just faked using 020 (they still show up as the selected model under emulation, of course). No 68060 support.

You could probably compile your own full Amiberry version, but I guess it would be slower on this hardware.

[amyren]

I´m trying to replicate my A4000 setup but I can only select 8MB Fast instead of 16MB, is that supposed to be that way ?

And if so : why  :'( ?

As you might have discovered yourself by now, although the setup selection only goes up to 8MB, an 8MB additional memory is added anyway when using the A4000 setup. So you will get 16MB anyway. You can even add some slow ram on top of this.

[amyren]

But the same reason applies, the memory settings are for basic fast ram / Z2 so only go up 8 Mb each or Chip and fast and only 2Mb chip if more than 2Mb fast

And those extra 8MB which is hidden in the RAM selection are Z3 RAM?