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The Amiga 1000 had to get the Kickstart ROM from floppy into RAM in 1985.

I think that counts.

I could see an argument either way.

Particularly since the data on the floppy isn't directly addressable, so it's not really shadowing another region.

I don't think that does count as shadowing, unless the floppy is mapped into memory and then the RAM is later mapped at the same address.

Once loaded into RAM, the WORM latch is closed and the RAM becomes non-writable, and accessible at a different memory address[0], which is the same address other Amiga have a physical ROM mapped at.

0. https://retrocomputing.stackexchange.com/questions/1140/how-...

Then you have to include the C64 where the ROM could be copied into RAM and then modified to allow extra functions.

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