From owner-freebsd-hardware Wed May 17 19:12:36 1995 Return-Path: hardware-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id TAA21000 for hardware-outgoing; Wed, 17 May 1995 19:12:36 -0700 Received: from disperse.demon.co.uk (disperse.demon.co.uk [158.152.1.77]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id TAA20992 for ; Wed, 17 May 1995 19:12:32 -0700 Received: from post.demon.co.uk by disperse.demon.co.uk id aa29836; 18 May 95 2:55 GMT-60:00 Received: from bagpuss.demon.co.uk by post.demon.co.uk id aa17511; 18 May 95 2:54 GMT-60:00 Received: (karl@localhost) by bagpuss.demon.co.uk (99.9/99.9) id CAA03882; Thu, 18 May 1995 02:55:58 +0100 From: Karl Strickland Message-Id: <199505180155.CAA03882@bagpuss.demon.co.uk> Subject: Re: bad memory.. To: "Rodney W. Grimes" Date: Thu, 18 May 1995 02:55:56 +0100 (BST) Cc: freebsd-hardware@FreeBSD.org In-Reply-To: <199505180140.SAA13066@gndrsh.aac.dev.com> from "Rodney W. Grimes" at May 17, 95 06:40:22 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Content-Length: 1654 Sender: hardware-owner@FreeBSD.org Precedence: bulk > > > > system: 486/33 isa, aha1542, 16mb > > > > added another 16mb and it went crazy with programs dumping core, and > > kernel traps all over the place. so i suspect the memory is bad (this > > machine has run with 20Mb previously, and has bounce buffers configured > > etc).. > > > > Try adding 1 wait state to the memory setup in the BIOS if you can. I > found that my ECS EISA/VLB board would run on ``fastest'' with 4 4MB-60nS > simms, but add 4 more and I had to slow it down to ``faster''. This > is the same as adding 1 wait state to main memory cycle times. I'll try this! > > On FreeBSD 1.x, the memory test doesnt complain. I remember reading > > the BIOS's memory test is crap. What should I use to test memory? > > FreeBSD is one heck of a memory tester, but it does not point to the > location of the failure. You *should* get an NMI for a parity error, > but gross memory failure (ie 2 bit or more) is often missed by this > type of logic. > > > (currently the machine has 4x4Mb 30 pin 9-chip simms, giving 16Mb. > > the new 16Mb is 4x4Mb 30 pin 3-chip simms. that shouldnt cause > > any problems right?) > > No, that should not cause a problem. Are the memory simms the same > speed, and at least 70nS or faster? What motherboard is this? all 70ns simms.. ill find out the name of the board, uses the opti chipset tho.. Thanks! -- ------------------------------------------+----------------------------------- Mailed using ELM on FreeBSD | Karl Strickland PGP 2.3a Public Key Available. | Internet: karl@bagpuss.demon.co.uk |