Poking memory

What memory is restricted by being in User mode versus Svc mode = Tks

I did have a BASIC program which displayed the address and permission of each memory page, but it was written back in the days of the 1MB Archimedes, with 4GB in a Pi 4, I’ve never let it run for more than a few hundred screen fulls.

I think the system heap is privileged only, the rom is obviously executable but not writable, the RMA and application spaces are user rwx, and I think you can choose for each dynamic area. But I don’t really know for sure.