Map of Physical Memory
000000 ----- | 512k Chip mem
000000 ----- | Reserved
200000 ----- | 8 Megabyte memory space for Auto Config Expansion Devices.
A00000 ----- | Reserved
BFD000 ---- | I/O for 8520's
C00000 ----- | CPU RAM
DFF000 ---- | Custom Chip Addresses
E00000 ----- | Reserved
E80000 ----- | Auto Config Expansion Decoding
F00000 -----| Reserved
F00000 ---- | Reserved
FFFFFF --- | ROM