Hi
One thing that is worth doing that I've seen done on
a Z8000 system is to map instruction memory into
a different area of physical memory than the data memory.
I don't recall but I think there is status information from
the Z80 about what type of fetch or store is being done.
The idea is that you are not limited to 64K. One could
get close to 128K on a Z80 at any one time. If all the
instruction was ROM, there would be no need to have
only ROM in that space for data memory. It could be
saved as useful data memory. You couldn't have data
tables in the ROM but that could be handled by bank
switches if needed.
Just a thought
Dwight
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