@Oli_hd:
I would urge you to if possible increase the pin-count a little bit and include the last 8-bits of address lines and the required signals for bus-mastering the cpu-bus it is connected to.
The reason for this is that most current expansions applicable to that interface are rather bandwidth intensive and thus propose quite a big load for the cpu if it has to do the data transfers to/from the expansion from/to the memory by itself.
These features would make it possible to create efficient expansions which doesnt hog the cpu. For example a 10/100MBit Ethernet expansion which could do its own memory transfers.
/Patrik
