Can someone explain this?
Let's say I wrote a code that uses the Hollywood Registers or the GPIO unit.

I've noticed (from the PPC side via a simple Gecko code) if I write something like to light up the Disc Drive or change the output color of the VI_SOLID, it can only take effect via Virtual Mode.

If I execute the same snippets of code in Real Mode or during an Exception, there is zero effect. I've tried loading/storing to 0x0D00XXXX, 0x0D80XXXX, 0xCD00XXXX, and 0xCD80XXXX during Real Mode. No effects/changes happen. The game doesn't crash at all using any of those address schemes, it's just as if the snippets of code don't exist.

Can somebody explain this?

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