Path: utzoo!mnetor!uunet!wucs1!wuphys!lel
From: lel@wuphys.UUCP (Lyle E. Levine)
Newsgroups: comp.sys.amiga
Subject: Re: A2000 and CPU slot
Message-ID: <525@wuphys.UUCP>
Date: 23 Mar 88 18:27:35 GMT
References: <8803222026.AA06299@jade.berkeley.edu>
Reply-To: lel@wuphys.UUCP (Lyle E. Levine)
Organization: Physics Dept., Washington U. in St. Louis
Lines: 47

In article <8803222026.AA06299@jade.berkeley.edu> CRONEJP@UREGINA1.BITNET (Jonathan Crone) writes:
>
>What happens to the A2000's 68000 when the 68020 goes in?
>I know that the logic on the 86pin connector provides for the coprocessor
>board to steal the system from the 68000 (I think thats right isn't it??)
>
>but does the 68020 run everything in the system or is the
>68000 run as a I/O processor like in some maxi-desktop systems that i've
>seen running un*x???

The system will be controlled by EITHER the 68000 or the 68020.
Period.  To change this (I believe) would entail a large redesign of
both the 2620 board, and the Amiga motherboard.  
	As I recall, Andy once mentioned that you can disable the 2620
at boot time to allow one to use just the 68000 if desired.  This was
a VERY GOOD IDEA!!!  Thanks Commodore! (This is still true,... isn't
it?....)

>I/O  but with two 68XXX 's under the hood the A2500 could sure make the
>MacII look like a slug.

What with the MAC II's sluggish OS and lack of the Amiga's custom chip
set, I'd bet on the amiga anyway!  Also, the 68881 is asynchronus, so
you should be able to use a 25MHz chip (independent clock Andy?) for
the math coprocessor.

>This of course is just my opinion....
>
>
>jpc
>
>====================================================================
>Jonathan P. Crone
 ^^^^^^^^^^^^^^^^^
Before our site got it's posting fixed, I got a letter from someone
about a plotting program of mine.  Was that from you?  As I recall,
our mailer was also fritzed and I couldn't respond.  Your name sounds
familiar.

==========
IBM is a Division of Sirius Cybernetics Corporation
"their fundamental design flaws are completely hidden by their
superficial design flaws."  
			- "So Long And Thanks For All The Fish"

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