Dumb question on RAM expansion

[Generale]

Hi there. I'm sitting here looking at an RAS-512K ram expansion card.
There is something bothering me. It's just got the RAM, a clockchip, and some passive components. What's stopping it from being mirrored through the entire memory range? Is it Gary doing this?

[Generale]

So is Gary only good for 1mb?....
Let me see. Well, I know Agnus is lazy and only supports 512k of chip...
Just going to have a look at the schematics to see if that offers a hint.

Thanks for that though.

I was just asking because I know the cpu is good for 16mb, but I just wanted to doctor the ram expansion (it has a dead RAM) and put 1mb on it, but I'm not sure if its possible is all.