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Originally Posted by ReadOnlyCat
However, to be more precise. As far as stock machines are concerned, ECS is definitely needed for the chipset to be able to use 1MB of chip RAM.
Sure, one can simply upgrade Agnus but not everyone modifies their machines and knowing what to expect from the stock versions is important.
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Actually quite a lot of A500s (including the one I had as a kid) shipped with the 8372A Agnus, and thus could access 1 meg of Chip RAM with a simple jumper mod on the motherboard - even though the rest of the chipset was OCS.
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Is the OS capable of using that RAM as chip RAM? I twiddled and experimented extensively with slow/chip/fast RAM back in OCS and ECS days and I do not remember being able to use my OCS A500 512Kb expansion as chip RAM back then.
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No, the OS would need patching to translate addresses between the two ranges.