Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!wuarchive!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: A3000 T is for TOWER
Keywords: TOWER,A3000,3000,T,NEW,computer
Message-ID: <21310@cbmvax.commodore.com>
Date: 6 May 91 21:58:51 GMT
References: <1991May5.134321.25252@sugar.hackercorp.com> <2a6g4dh@rpi.edu>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 20

In article <2a6g4dh@rpi.edu> metahawk@itsgw.rpi.edu (Wayne G Rigby) writes:
>In article <1991May5.134321.25252@sugar.hackercorp.com> davidm@sugar.hackercorp.com (David Martin) writes:

>It probably would be possible to build a 68000 "accelerator" card, 

Actually, no.  It's reasonably efficient to convert 68030 bus signals into
68000 signals.  The A3000's Buster chip does this to support Zorro II modes on
the Zorro III bus.  Going the other way is pretty inefficient.  The A3000's
Buster chip also does this, to support Zorro II DMA into A3000 Chip RAM, but
it's not pretty.  Any 68000 plug-in toy would tend to run slower than an A500,
which wouldn't make things any more compatible than they are now.  Also, the
A3000's Fast RAM and a number of I/O registers could not be accessed, since
they're either out of 24-bit space, or 32-bit only registers.

>                                   Wayne Rigby

-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
      "That's me in the corner, that's me in the spotlight" -R.E.M.