Delivered-To: jake@vapourforge.com Received: from pch.mit.edu (PCH.MIT.EDU [18.7.21.90]) by mail.vapourforge.com (Postfix) with ESMTP id B5426CFC0 for ; Fri, 23 Jul 2010 02:02:15 +1000 (EST) Received: from pch.mit.edu (pch.mit.edu [127.0.0.1]) by pch.mit.edu (8.13.6/8.12.8) with ESMTP id o6MFroIw025758; Thu, 22 Jul 2010 11:53:51 -0400 Received: from mailhub-dmz-2.mit.edu (MAILHUB-DMZ-2.MIT.EDU [18.7.62.37]) by pch.mit.edu (8.13.6/8.12.8) with ESMTP id o6MFrnuS025753 for ; Thu, 22 Jul 2010 11:53:49 -0400 Received: from dmz-mailsec-scanner-2.mit.edu (DMZ-MAILSEC-SCANNER-2.MIT.EDU [18.9.25.13]) by mailhub-dmz-2.mit.edu (8.13.8/8.9.2) with ESMTP id o6MFqhfH007689 for ; Thu, 22 Jul 2010 11:53:49 -0400 X-AuditID: 1209190d-b7c82ae000000a16-c7-4c48698f2001 Received: from mail-gy0-f177.google.com (mail-gy0-f177.google.com [209.85.160.177]) by dmz-mailsec-scanner-2.mit.edu (Symantec Brightmail Gateway) with SMTP id 8E.9F.02582.F89684C4; Thu, 22 Jul 2010 11:53:51 -0400 (EDT) Received: by mail-gy0-f177.google.com with SMTP id 2so984140gyf.36 for ; Thu, 22 Jul 2010 08:53:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id :disposition-notification-to:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=zaZ2mEUlWMZCX8nlRHlu6YqE1MTnHvnhF1xrvg3R/vA=; b=BR4gDzJQaWFR7a/KVzX/wyM5TrImdP0FoCbd+eHUILbDPe6+TSL8Iq+it0RiVCTavZ ZDo9/BEygeFabwVMo7uBys3rFgi0FUrLBjjzbeNj2rDgJbvqS/tS8gL3TJNwAdjkMRC/ LxJCjpW66eh2EcKHn2YYtGKTtY24BnJNj2hIE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:disposition-notification-to:date:from:user-agent :mime-version:to:subject:references:in-reply-to:content-type :content-transfer-encoding; b=d8vaMRfPw5AT4pzaGmrmZb2QN6Galhc+jqixjkU0OOvtufuzRkRVkpCSwLFVkATAXq j8Vn/sv+XTbeK3w2lWGI7N/JfQrhcTQ4/TUhLXmgG78Df23SvoR5XNV4EJqJOfpuArT2 Mb5ZeH9C40z/1Ob5KCSHGhjPHtkfaXmOguoww= Received: by 10.150.218.20 with SMTP id q20mr4053612ybg.264.1279814029242; Thu, 22 Jul 2010 08:53:49 -0700 (PDT) Received: from [192.168.7.108] (189.27.179.207.dynamic.adsl.gvt.net.br [189.27.179.207]) by mx.google.com with ESMTPS id 36sm7551312ybr.8.2010.07.22.08.53.47 (version=TLSv1/SSLv3 cipher=RC4-MD5); Thu, 22 Jul 2010 08:53:48 -0700 (PDT) Message-ID: <4C486988.8090401@gmail.com> Date: Thu, 22 Jul 2010 12:53:44 -0300 From: enkitec@gmail.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6 MIME-Version: 1.0 To: "Microcontroller discussion list - Public." Subject: Re: [EE] Faultfinding Z80 based circuits References: <009001cb29b0$9607fd40$0100000a@roger29qgfmb4o> In-Reply-To: <009001cb29b0$9607fd40$0100000a@roger29qgfmb4o> X-Brightmail-Tracker: AAAAAhVGFPIVRtIh X-Topics: [EE] X-BeenThere: piclist@mit.edu X-Mailman-Version: 2.1.6 Precedence: list Reply-To: "Microcontroller discussion list - Public." List-Id: "Microcontroller discussion list - Public." List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: piclist-bounces@mit.edu Errors-To: piclist-bounces@mit.edu On 22-Jul-10 12:14, Roger Weichert wrote: > The CRO shows signal on the data lines and the address lines (although not > the same as a known good one), but nothing on the RD, IROQ, WR lines etc. > > A short circuit perhaps? In case yes, desolder the pins one by one and verify again. Mark Jordan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist