Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!portal!cup.portal.com!DavidS
From: DavidS@cup.portal.com (David Kenneth Schreiber)
Newsgroups: comp.sys.amiga
Subject: Re: MotherBoard(Rev 6) Noise Problem with HardFrame
Message-ID: <21184@cup.portal.com>
Date: 11 Aug 89 01:41:51 GMT
References: <268@syteke.UUCP> <21093@cup.portal.com> <18629@gryphon.COM>
Organization: The Portal System (TM)
Lines: 44

In article <18629@gryphon.com> jdm@gryphon.com (John Mesiavech) writes:
>In article <21093@cup.portal.com> DavidS@cup.portal.com (David Kenneth Schreibe
r) writes:
>>in article 268@syteke.UUCP, Jim Sanches writes:
... 

>The local dealers here in Cal have known of problems with the rev 6
>motherboard for some time (since they started getting them).  The
>Rev 6 motherboards have significant noise problems with the bus slots,
>and any timing-sensitive peripheral won't work reliably on them.  These
>types of devices include DMA peripherals, and ram expansions.
> 
>If your board rev is 4.5, you don't have the problem.
> 
>At first, the dealers thought it was the Fat Agnus chip that caused the 
>problem, but experience has since proven that it's not.
> 
>BTW David, in me personal machine I'm running a Hardframe-2000 connected
>to TWO Quantum drives (a Pro-40 and a Q280), with a 8-up SIMM board
>populated to 4 megs, a tablet card (Easyl), AND a A2620 board.

>I can definitely say that there are no Guru problems with the above
>mentioned setup.  

>You may have gotten a defectinve board somewhere.

>John

Perhaps I didn't make myself as clear as I should have.  I had problems
galore with the Microbotics stuff & my Rev. 6 motherboard.  But Go Amigo
swapped the 2000 for a Rev. 4.5 machine with a one-meg fat agnus about
two weeks ago.  I've had no problems with this setup.  Thanks for the
info though (I'm glad there's a fix).  I'm surprised that the defect was
in the motherboard, though.  A local dealer tried the Hardframe w/ a
Commodore and a Supra 8 meg memory board (one at a time, of course), and
found no problems as he did with the 8-UP.  His suggestion at the time
was to switch memory boards.  Sounds like he wasn't as informed as he
should have been...:-(

                                                  David Schreiber
at                                                DavidS@cup.portal.com

-You know you have a good hard drive setup when you find yourself cold
 booting just for the exhilaration of it.