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.