Amiga 500: Interfacing to the expansion slot

[mechy]

Are there any good books or tutorial on how to develop (interface) hardware to the Amiga 500's expansion slot?

might take a look here:

http://aminet.net/search?query=zorro

there are hacks to add a proper zorroslot which can use regular zorro2 cards etc,

also check hard/hacks directories on aminet.