kitcon 504 memory mapped

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I have a kitcon-504 board from phytec with a C504 8051 controller.

Does anybody have such a boar and can tell me how to simply realize
that i have 32 states at the adressbus and i/o at the databus.
The problem is that I have to talk with a ISA network card on that bus,
all my ports are already full. So I thougt of mapping the 32 bytes to
the memory. in the documentation there is something written about i/o
area with chip-select and so on, but i dont understand that.

hope somebody can help me.


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