Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Motherboard revision differences
Message-ID: <12990@cbmvax.commodore.com>
Date: 2 Jul 90 07:53:25 GMT
References: <4060@uqcspe.cs.uq.oz.au> <12955@cbmvax.commodore.com> <[2688b902:593.2]comp.sys.amiga.hardware;1@wcbcs>
Reply-To: grr@cbmvax (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 22

In article <[2688b902:593.2]comp.sys.amiga.hardware;1@wcbcs> akcs.clemon@wcbcs (Craig Lemon) writes:
> >Rev 3.x motherboards are the orginal "Dealer Demo" units
> >Rev 4.x are the production boards with 256K DRAM chips.
> >Rev 6.x are the production boards with 1M DRAM chips.
>
>    I'm also interested in the question and answer previously stated.  I have
> heard of the 2620 and 2630 not working on some 4.x motherboards due to some
> sort of bus capacitors or some such thing.  I'm particularly interested in
> 4.2.  If the only difference is SUPPOSED to be the capacity of each DRAM,
> why do the _Commodore Built_ accelerators fail to function (as I said, this
> is what I've been told)?

There is a pullup resistor that is added various versions of the motherboards
as a pre-requisite for installing an A2630.  Adding this resistor is supposed
to be part of the dealer installation of the A2630, otherwise you need to get
in touch with a service center.  For those unofficially inclined, the details
have been posted in comp.sys.amiga.* more than a few times...

-- 
George Robbins - now working for,     uucp:   {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing:   domain: grr@cbmvax.commodore.com
Commodore, Engineering Department     phone:  215-431-9349 (only by moonlite)