From what I gather RAM is mapped from 0x00000000 to 0x01FFFFFF when fully populated with 32MB
The question arises when 4MB SIMMs are involved. In the case of 4MB or 20MB installed, the manual says that:
My question is: Where exactly is the RAM mirrored?If 4 MB (20 MB) DRAM are installed, accesses beyond $003F FFFF ($013F FFFF) are mirrored to (upper) 4 MB.
I don't have a 4MB SIMM, so I can't test it out, and although this is a purely experimental development, it would be nice to be complete, so that, should anyone else what to play with it, it will work, regardless of RAM configuration.
Nick