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From: krauss@mansw1.enet.dec.com (Michael Krauss)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Accelerating the 2620
Keywords: Faster 2620
Message-ID: <1991Mar8.172149.22306@hollie.rdg.dec.com>
Date: 8 Mar 91 17:21:49 GMT
References: <15562@chaph.usc.edu>
Sender: news@hollie.rdg.dec.com (Mr News)
Reply-To: decwrl!mansw1.enet!krauss
Organization: Digital Equipement GmbH
Lines: 37

In article <15562@chaph.usc.edu>, aliu@aludra.usc.edu (Alex C. Liu) writes:

>
>Hi, I have a neato 2620 board.  I was wondering, it is possible to
>make it run faster.  (Not just overclocking, but also replacing the
>chips with faster version, are there 28Mhz of 68020/68881/68851
>chips?)
>
>I am aware that the 2620 is a synchronous board, so probably I will
>have to increase only in multiples of 7.44 (or is it 14Mhz?) but is it
>possible?  Is so how?  
>
>[Please dont send me suggestions about dropping the 2620 (9.8m/s^2
>acceleration?) and getting a 68030 based board]
>
>BTW, is the 68882 pin compatible with the 68881?  What are the
>differences?

yes, it is pin compatible. if your 68881 is in socket, it's jutst plug'n'play.
the 68882 will give you somthing aroun 50% more speed with fp-calculations at
the same clock rate. i think there is a jumper on the board to clock it async.
to the 68020. if you can manage to use a new crystal you can buy a 50mhz 68882
and put it in. perhaps it'll work(depends on the rest of the board ?).

has anybody used already such a configuration ?

>
>Thanks in advance
>
>-Alejandro Liu
>(PS: All mispellings are intentional!)
>
--
==============================================================================
Michael Krauss			#include <std_disclaimer.h>
DEC Mannheim, Germany		"AMIGA or VAX, nothing else please !"
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