Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!apple!sun!imagen!atari!portal!cup.portal.com!FelineGrace
From: FelineGrace@cup.portal.com (Dana B Bourgeois)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Memory Map
Message-ID: <19335@cup.portal.com>
Date: 10 Jun 89 22:11:41 GMT
References: <17184@louie.udel.EDU>
Distribution: usa
Organization: The Portal System (TM)
Lines: 31

The Amiga Software Memory Map:

00 00 00 04     AbsExecBase

That's it.  Now I know that is what we already told you.  What you
really want is the Hardware Memory Map:

00 00 00 - 03 FF FF  256K DRAM
04 00 00 - 07 FF FF  256K DRAM (option card)  512K Chip RAM

08 00 00 - 1F FF FF  512K: Image of bottom 512K. Fat Agnus will expand
                           Chip RAM to 1Meg by decoding this area.
20 00 00 - 9F FF FF  8 Meg Expansion RAM space
A0 00 00 - BE FF FF  Images of registers
BF D0 00 - BF DF 00  8520-B: registers at even address only
BF E0 01 - BF EF 01  8520-A: registers at odd address only
C0 00 00 - DF EF FF  Reserved
DF F0 00 - DF FF FF  Coprocessor chip registers
E0 00 00 - E7 FF FF  Reserved
E8 00 00 - EF FF FF  Expansion Slot Decoding
F0 00 00 - F7 FF FF  Reserved
F8 00 00 - FF FF FF  KickStart: ROM or Write Only RAM

This is per RKM Addison-Wesley(white and purple) Hardware Reference
Manual.  There is more info on the register addresses and stuff.  But
unless you're into copy protection, or taking over the machine, or
hardware development, or just plain 'ol unfriendly hardware access,
there isn't a reason to dig into this stuff.  However, I hope this 
answers your question.

Dana