From owner-freebsd-questions@FreeBSD.ORG Mon May 16 05:25:46 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 35298106566B for ; Mon, 16 May 2011 05:25:46 +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 12D1F8FC08 for ; Mon, 16 May 2011 05:25:46 +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 p4G5PjMa041558 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Sun, 15 May 2011 22:25:45 -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 p4G5PjXL041557 for freebsd-questions@freebsd.org; Sun, 15 May 2011 22:25:45 -0700 (PDT) Received: from fbsd61 by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA13421; Sun, 15 May 11 22:03:30 PDT Date: Sun, 15 May 2011 22:02:54 -0700 From: perryh@pluto.rain.com To: freebsd-questions@freebsd.org Message-Id: <4dd0affe.XOOWAi+bOV2dBAI6%perryh@pluto.rain.com> References: <117637.44743.qm@web111903.mail.gq1.yahoo.com> <20110515103646.7558ddb2.freebsd@edvax.de> <4dd09401.Qf5DE46mpnXg4G2w%perryh@pluto.rain.com> In-Reply-To: User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Subject: Re: No keyboard after ports update, 2x moused_enable="YES" culprit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 May 2011 05:25:46 -0000 Daniel Staal wrote: > --As of May 15, 2011 8:03:29 PM -0700, perryh@pluto.rain.com is > alleged to have said: > > > The AT and PS/2 keyboard interfaces are electrically identical > > -- only the physical connector is different. > > --As for the rest, it is mine. > > The physical connector is all that actually needs to be different: > Hot-swap interfaces make a point of connecting ground before power, > usually be longer ground pins. The PS/2 should qualify on this point, provided it is wired _correctly_ (with the connector shell grounded both on the motherboard and in the cable). I'm less sure about the AT, which used a 5-pin DIN plug that may not even have had a shell-ground on the motherboard -- we were less concerned about generating RFI in those days. IIRC all 5 pins were the same length. It's possible this particular Belkin keyboard used longer pins for power and ground than for signal, so as to be safely hot-pluggable even if the motherboard didn't ground the connector shell. However, I've since gotten by with hot-plugging a PS/2 trackball on the same machine a couple of times, to clear lockups.