Get hold of Amiga Hardware Reference Manual.
Miner, Jay et al (1991). Amiga Hardware Reference Manual: Third Edition. Addison-Wesley Publishing Company, Inc. ISBN 0-201-56776-8.
IMO the best way to get hold of it is to buy Amiga Developer CD 2.1, it includes version in amigaguide and html. DevCD 2.1 includes tons of other material aswell, it's well worth the price.
The Dev CD 2.1 is available from most self respecting amiga dealers.
