Path: utzoo!attcan!uunet!bu.edu!orc!olivea!oliveb!amiga!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: Amax problems with the Amiga 3000
Message-ID: <13906@cbmvax.commodore.com>
Date: 20 Aug 90 18:25:20 GMT
References: <27770@nigel.ee.udel.edu>
Reply-To: daveh@cbmvax (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 30

In article <27770@nigel.ee.udel.edu> jlabelle@lynx.northeastern.edu writes:

>1. Can't handle math co-processor 88882
>   i.e. Excel

It might be a good idea to find out if Apple has some patch for this; the
68030<->68882 connection is defined by Motorola, not Apple or Commodore.  So
one would expect that it's purely a software issue, and perhaps something 
Apple fixes on disk for Mac IIs.  Just a guess...

>2. Can't handle 1x4 meg zipps or any other non-fast ram
>   i.e. Uses chip ram (actually, it can't handle any fast ram)

Many current Mac programs (and at least at one time the Mac OS itself) are
only 24 bit programs -- eg, they do evil things with the 8 bit of address not
used in pointers on 68000 CPUs.  So the A3000's Fast memory, which is at
$07000000-$07ffffff or so, depending on how much you have, is a problem for
the current Mac programs.  The new AMax might get around this by translating
some of that memory around with the MMU.

>3. Works only with USER mode

Say what?

>Joel M. LaBelle		Jlabelle@lynx.northeastern.edu		

-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
      Get that coffee outta my face, put a Margarita in its place!