From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E105C433B4 for ; Thu, 6 May 2021 06:32:44 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CB6D2613F9 for ; Thu, 6 May 2021 06:32:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CB6D2613F9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38776 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1leXYw-0007Pe-S2 for qemu-devel@archiver.kernel.org; Thu, 06 May 2021 02:32:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48314) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1leXXC-0006Mn-N6 for qemu-devel@nongnu.org; Thu, 06 May 2021 02:30:54 -0400 Received: from indium.canonical.com ([91.189.90.7]:46496) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1leXXA-000538-6D for qemu-devel@nongnu.org; Thu, 06 May 2021 02:30:54 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1leXX7-00019d-S0 for ; Thu, 06 May 2021 06:30:49 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id CD6C72E8186 for ; Thu, 6 May 2021 06:30:49 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Thu, 06 May 2021 06:21:09 -0000 From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <1895363@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Confirmed; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: mslade philmd X-Launchpad-Bug-Reporter: Michael Slade (mslade) X-Launchpad-Bug-Modifier: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9_=28philmd?= =?utf-8?q?=29?= References: <159987499082.17652.11658819873688678558.malonedeb@soybean.canonical.com> Message-Id: <162028206911.7036.11437604253628139589.malone@wampee.canonical.com> Subject: [Bug 1895363] Re: borland IDEs double up cursor key presses (need timing on PS2 port input) X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="d6ba96cccb3d3e356754af3137c6128a6c17e2a8"; Instance="production" X-Launchpad-Hash: 4aca80b4f73e0d842201d980cc2c0bcd9365a673 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1895363 <1895363@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Possible fix: https://www.mail-archive.com/qemu-devel@nongnu.org/msg804823.html ** Changed in: qemu Status: New =3D> Confirmed -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1895363 Title: borland IDEs double up cursor key presses (need timing on PS2 port input) Status in QEMU: Confirmed Bug description: Most DOS-era IDEs from Borland (I have tried Borland C++ 2.0, Borland C++ 3.1 and Turbo Pascal 7.1) exhibit strange responses to the keyboard. Cursor keys are registered twice, so each press of a cursor key causes the cursor to move twice. Also the other keys occasionally are missed or duplicated. From an internet search, the problem appears to be this. These programs read the PS2 input register multiple times per incoming byte, on the assumption that the byte will remain there for at least a few hundred microseconds, before the next byte (if any) appears there. qemu treats a read of the register by the guest as an acknowledgement of the incoming byte and puts the next byte into the register immediately, thus breaking the programs that expect each successive byte to stay in place for a while. The obvious solution is to use a timer to advance through the queued bytes. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1895363/+subscriptions