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, URIBL_BLOCKED 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 2B83EC4707F for ; Thu, 27 May 2021 05:12:23 +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 EE7C7613BF for ; Thu, 27 May 2021 05:12:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE7C7613BF 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]:60276 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lm8Jg-0005zO-UJ for qemu-devel@archiver.kernel.org; Thu, 27 May 2021 01:12:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55430) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lm8IN-0004a1-3Q for qemu-devel@nongnu.org; Thu, 27 May 2021 01:10:59 -0400 Received: from indium.canonical.com ([91.189.90.7]:44246) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lm8IK-0006bt-0F for qemu-devel@nongnu.org; Thu, 27 May 2021 01:10:58 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1lm8IF-0000Hi-4C for ; Thu, 27 May 2021 05:10:51 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 11F3D2E8136 for ; Thu, 27 May 2021 05:10:51 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Thu, 27 May 2021 05:01:28 -0000 From: Thomas Huth <1895363@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Fix Committed; 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 th-huth X-Launchpad-Bug-Reporter: Michael Slade (mslade) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <159987499082.17652.11658819873688678558.malonedeb@soybean.canonical.com> Message-Id: <162209168868.5770.11350043337385748832.malone@chaenomeles.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="802ed26817d1cdd050553dbe99cc8a3cad1a3bc7"; Instance="production" X-Launchpad-Hash: 57a2982c32328694a56c81564505535cccfc80c3 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=0.248, 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" The patch mentioned by Philippe has now been merged to the QEMU master branch (commit d1e45668d2128b064). Michael, could you maybe check the current git version to see whether this problem has been fixed now? ** Changed in: qemu Status: In Progress =3D> Fix Committed -- = 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: Fix Committed 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