From owner-freebsd-hackers@FreeBSD.ORG Sat Apr 23 23:25:10 2011 Return-Path: Delivered-To: hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 45F491065679 for ; Sat, 23 Apr 2011 23:25:10 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [IPv6:2607:f678:1010::34]) by mx1.freebsd.org (Postfix) with ESMTP id 1EAAB8FC16 for ; Sat, 23 Apr 2011 23:25:10 +0000 (UTC) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id p3NNP4ho010668 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sat, 23 Apr 2011 16:25:05 -0700 (PDT) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id p3NNP4T2010667; Sat, 23 Apr 2011 16:25:04 -0700 (PDT) Received: from fbsd61 by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA14915; Sat, 23 Apr 11 16:20:44 PDT Date: Sat, 23 Apr 2011 16:19:38 -0700 From: perryh@pluto.rain.com To: imp@bsdimp.com Message-Id: <4db35e8a.R5LDMfg8cygIRbfF%perryh@pluto.rain.com> References: <4DB3142A.4000807@charter.net> <1E3F5B85-5A1A-4118-A9D8-932F46619C79@bsdimp.com> In-Reply-To: <1E3F5B85-5A1A-4118-A9D8-932F46619C79@bsdimp.com> User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: lankfordandrew@charter.net, hackers@freebsd.org Subject: Re: scd and mcd X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Apr 2011 23:25:10 -0000 Warner Losh wrote: > mcd and scd are ISA-only devices ... They were important for the > 386 (now not supported) and 486 machines. Since the 486 machines > in question maxed out at 32MB, and 8.x has trouble running in 32MB > on x86, I'm guessing there aren't too many 486 SX/DX machines > running 8.x. 486 were the last for which ISA was the primary bus, but ISA was still present (bridged from PCI) on most Pentium systems and common at least as recently as Pentium-II. (I don't have a disassembled P-III handy to check whether it has an ISA slot.)