From owner-freebsd-questions Thu Dec 14 17:57:36 1995 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id RAA11857 for questions-outgoing; Thu, 14 Dec 1995 17:57:36 -0800 (PST) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id RAA11851 for ; Thu, 14 Dec 1995 17:57:28 -0800 (PST) Received: from msmith@localhost by genesis.atrad.adelaide.edu.au (8.6.12/8.6.9) id MAA27908; Sat, 16 Dec 1995 12:28:48 +1030 From: Michael Smith Message-Id: <199512160158.MAA27908@genesis.atrad.adelaide.edu.au> Subject: Re: Upgrade - CPU, clock? To: alan@trickler.uu.silcom.com (Alan D. Trombla) Date: Sat, 16 Dec 1995 12:28:48 +1030 (CST) Cc: wes@intele.net, questions@freebsd.org In-Reply-To: <199512142207.OAA01240@trickler.uu.silcom.com> from "Alan D. Trombla" at Dec 14, 95 02:07:49 pm MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@freebsd.org Precedence: bulk Alan D. Trombla stands accused of saying: > Am I correct in assuming that a DX4/120 has (external) bus speed of 33MHz? No, it's a 40MHz part. > My manual (probably written pre-DX4) has 3 sets of jumper settings for: > 1. 486DX/DX2 > 2. 486SX > 3. 487SX/Overdrive > Although there is no listing for DX4 CPUs, wouldn't a DX4/120 be (from > the motherboards point of view) the same as a DX2/66 ? No. You have a 5v-only motherboard. The fastest CPU you can use is the Intel DX4-100 with onboard 3v regulator. > >Beware that FreeBSD has problems with *some* Cyrix and AMC cpus. > > Can anyone give me a list? No; it depends on the masks used for the parts, and this information is not easily obtained. For your purposes, the above part _does_ work. > The motherboard supports 486DX50 (manual: "To change the CPU speed you > must change the oscillator", meaning cahnge the crystal?). So it > should support a 486DX2/100 (at 50Hz)? Is there such a thing? No. The fastest 5v CPU available, AFAIK, is the part mentioned above. > Alan D. Trombla--------------------------------------alan@iplab.ece.ucsb.edu -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 041-122-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] "Who does BSD?" "We do Chucky, we do." [[