@SamuraiCrow
The AT-onr that I know of was slapped between CPU and CPU-socket.
I think you had the KCS-Power-board in mind, XT-compatible with
768k of RAM. This one was only seen as "memory" for the A500, and one
could even use it as 512k expansion for the A500.
The only think that I don't know is wether it supported both addresses (for Chip
and "Ranger" mem).
