Path: utzoo!attcan!uunet!cs.utexas.edu!rutgers!sun-barr!sun!imagen!atari!portal!cup.portal.com!morris-ng
From: morris-ng@cup.portal.com (Yuklung Morris Ng)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Memory Map
Message-ID: <19371@cup.portal.com>
Date: 11 Jun 89 09:14:26 GMT
References: <17184@louie.udel.EDU>
Organization: The Portal System (TM)
Lines: 39

In the article by  new@udel.EDU (Darren New):

>A while back, somebody asked about the memory map of the amiga and
>was answered by "ExecBase is a $4". Although correct, this is not

In Amiga internal structure, the machine only guarantee a few locations
for a certain things, e.g. $4 for ExecBase, $100 for guru information...
however, the other stuff are floating on the memory.  It maybe different
whenever you reset the computer.

>what I'm asking. I'm just curious about the actual memory mapping
>in the Amiga. Where IS chip ram? What is $c00000 ram? Where is FAST ram?

Chip ram is in $420-$80000, the next .5 fast ram on A500/A2000 is at
$C004E8-$C7E800.  The extra ram may start at $200020 (the A2058) or
other locations, depend on the manufacturers.
>where do devices configure? Where is the ROM/WCS//re-live-boot-rom-on A1000s?
>And so on...     --- Darren

Again the location of the devices may vary a lot.  Maybe the ROM/WCS//,etc.
That's why you need to know the ExecBase which tell you where these stuffs
are at.

According to your messages, you must be get use to the other machines
structure.  Remember on Amiga all memory location (well most) are abstract.
Remember when I used my Apple II, -151 is the michine code entry, 800 is the
BASIC code starting point... Now it is totally different in Amiga.

Good luck!



+------------------------------+------------------------------------+
|  Morris Y. L. Ng             |  Usenet: morris-ng@cup.portal.com  |
|  Computer Science & Finance  |  Portal: Yuklung Morris Ng         |
|  San Jose State University   |  Home  : (###)###-#### (Guess?!)   |
+------------------------------+------------------------------------+
|           "Be my Amiga!  And I will be your Amigo!"               |
+-------------------------------------------------------------------+