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Date: Mon, 5 Apr 2010 12:20:50 +0200 (CEST)
From: Gerhard Wiesinger <lists@wiesinger.com>
Subject: Re: [Qemu-devel] Absolute Mouse in VNC and debug ports patch
In-Reply-To: <201004031626.52399.paul@codesourcery.com>
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	<201004031626.52399.paul@codesourcery.com>
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To: Paul Brook <paul@codesourcery.com>
Cc: qemu-devel@nongnu.org

On Sat, 3 Apr 2010, Paul Brook wrote:

>> This is my first contribution to QEMU: I've written a virtual piece of
>> hardware (e.g. ports) that the mouse pointer can be used as an absolute
>> pointing device even with non USB devices, e.g. with DOS and doesn't need
>> any high memory usage USB driver. This is necessary for e.g. VNC remote
>> access, this was my primary motivation.
>
> Why not just use the existing vmmouse?
>
>> To use it you need a mouse driver (e.g. cutemouse,
>> http://cutemouse.sourceforge.net/) and an QEMU mouse TSR.
>> Further the mouse TSR emulates also a HP-HIL 45911 tablet digitizer. This
>> device has been chosen because an Interrupt interface exists at INT 6Fh and
>> therefore it is relativly easy to emulate (all other devices I've evaluated
>>  use the serial port and are therefore much more complex to emulate)
>
> However emulating an actual tablet connected to the serial port means you
> don't need any custom guest software.
>

Hello Paul,

There is another reason: I'm using interrupts, therefore the Guest OS must 
not poll (except DOS, where the Mouse interface is a polling one).

Ciao,
Gerhard

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http://www.wiesinger.com/