Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: AT bus in 2000 and 3000
Message-ID: <21093@cbmvax.commodore.com>
Date: 30 Apr 91 23:41:06 GMT
References: <8848@crash.cts.com>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 31

In article <8848@crash.cts.com> andyg@crash.cts.com (Andy Guevara) writes:
>Please excuse my dumb question...

>We are looking at possibly using the Amiga chassis as a controller
>to house AT bus cards and still run 68000 programs to control the 
>cards. My question: Is the AT side EISA? 

No.  "AT Slot" == "ISA Slot", at least in 90's-speak.  "ISA" means "Industry
Standard Architecture", since apparently "the industry" has taken over this
bus since abandoned by IBM (can't say as I blame them, even if they did 
invent it).  Enhanced ISA, EISA, is an attempt to build a bus that's upward
compatible with ISA and somewhat modern (multi-mastered, shared-interrupts,
intelligent configuration, the normal Amiga-bus stuff).

>The reason is that we might try to use alternate processors on the
>AT side. 

I guess that would be a job for EISA, if your only other choice is ISA.

>Also, do I understand correctly that the 3000 only has 2 AT slots?

The A3000 has two ISA slots that only have power attached to them.  You plug
in a "Bridge Card", which is either a PC-XT or AT on an Amiga bus card, and
the ISA bus gets driven.  That leaves one free slot on the A3000.  With an
A3000T, you can have three free ISA slots.


-- 
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.