From owner-freebsd-hackers Fri Mar 22 13:51:14 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id NAA02502 for hackers-outgoing; Fri, 22 Mar 1996 13:51:14 -0800 (PST) Received: from rocky.sri.MT.net (rocky.sri.MT.net [204.182.243.10]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id NAA02491 for ; Fri, 22 Mar 1996 13:51:09 -0800 (PST) Received: (from nate@localhost) by rocky.sri.MT.net (8.6.12/8.6.12) id OAA20160; Fri, 22 Mar 1996 14:51:02 -0700 Date: Fri, 22 Mar 1996 14:51:02 -0700 From: Nate Williams Message-Id: <199603222151.OAA20160@rocky.sri.MT.net> To: Terry Lambert Cc: hackers@freebsd.org Subject: Re: Crash advice needed (long) APPENDIX A In-Reply-To: <199603222104.OAA03306@phaeton.artisoft.com> References: <199603221842.TAA00680@yedi.iaf.nl> <199603222104.OAA03306@phaeton.artisoft.com> Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > > Apart from the fact that 20' is too long (3m max for fast-SCSI, 1542C is > > a Fast capable controller that will try to use 10Mbytes/sec with a Fast > > device) Adaptecs tend to work better if the controller is at the end of > > the SCSI bus. So, either use the internal or external connector but not > > both at the same time > > Using both busses is not a problem for the CF; the C and prior can > only successfully use the internal or the external unless there is > a modification (invloving a capacitor and a resistor soldered on near > the external connector). Bzzt. Thanks for playing, but no dice. I've run my 1542B (which was *very* much prior to the C model) with internal/external devices since a month after I got it. I updated to the most recent BIOS revsion before I did that, but I've had no problems that have been due to my board. It's worked flawlessly running SCSI-I and SCSI-II disks, tapes, and CD's externally. (Though I haven't yet stuck a scanner on it. That'll be the next project. :) Termination seems to be less critical on older SCSI devices, as I ran with the adapter terminated, external devices, and with both my internal drives terminated until I got my new disk a year and a half ago. Now I have to run everything properly terminated, and have added an external 4MM DAT w/out problems. I'm running a mixture of SCSI-I and SCSI-II peripherals if that makes any difference. Termination <-> External S2-DAT <-> 1542B <-> Quantum 1.8G S2 \ <-> Quantum 40MB S1 <-> Tanberg 150 S1/S2(?) <-> NEC 3X CD <-> Termination My Tandberg claims to be a SCSI-II device, but I don't think it is. Nate