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Wed, 25 Aug 2021 07:20:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=launchpad.net; s=20210803; t=1629876046; bh=Im3TSqGJfaYHbNc8PQo7i3/vU9HZf1UOXe8+WaAzTyQ=; h=MIME-Version:Content-Type:Date:From:To:Reply-To:References: Message-Id:Subject; b=TkPXsl3q+fK0JZJIJsY9dg42DiDeDkYzZ/kGZOUy0QDFEL+8kjs68kNG37hyp6bTJ 6ZZ4KxKpoj6106yDRTDTcw/A1eqkBabcDcO7U8//LFSQzys9+tkCwZ0U9dE5RNWYE1 E5PC5GOQmzmM5Oy8nfZwWe82ntjHkV/UhqJNsBdj99qLnjw6Mv7Q7kdlOgmNpyYLH+ 6lLkvCiHGwPtoWGf9MkePMZCDyKTZMPnxr/1tmdi4Q4ptM5fYm0ekgcuUA6oVX2ZKT wF9a90UFfLci221I0+GvoeSpqgf3OfwQ+cvvvtEpEbIpE+S35ByC3xljBuMbjrgDmv bCbmEJPlVE8eg== Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 702B92E81A1 for ; Wed, 25 Aug 2021 07:20:45 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 25 Aug 2021 07:15:29 -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 Released; 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: <162987573117.28460.1303228431852680763.launchpad@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="7edb2d45353e030166106ae05838b77ab406edcd"; Instance="production" X-Launchpad-Hash: 0470e13a7ea99f3f96a29e959c83d8bcb10bd735 Received-SPF: pass client-ip=185.125.188.251; envelope-from=noreply@launchpad.net; helo=smtp-relay-services-1.canonical.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-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" ** Changed in: qemu Status: Fix Committed =3D> Fix Released --=20 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 Released 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