old-www/HOWTO/XFree86-Second-Mouse/xfree3.html

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>4. XFree 3.x</A
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>In XFree 3.x, additional pointing devices, like mice or tablets, are defined
through the use of an <EM
>Xinput</EM
> section. The primary mouse is
defined as usual:
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>Section "Pointer"
Protocol "PS/2"
Device "/dev/mouse"
EndSection</PRE
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>
In the case above, it's a regular three-button PS/2 mouse, which works for the
trackpoint as well. Now, for the USB mouse:
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> Section "Xinput"
SubSection "Mouse"
DeviceName "USB Mice"
Protocol "IMPS/2"
ZAxisMapping 4 5
Port "/dev/input/mice"
Alwayscore
EndSubSection
EndSection</PRE
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>
My mouse is a wheel mouse, thus the protocol is <EM
>IMPS/2</EM
>. ZAxisMapping line is also needed for the wheel to work.
I also want the mouse to always work alongside the other one, and this is achieved
through the <EM
>AlwaysCore</EM
> option. If. for example, this was
a serial mouse, the <EM
>Port</EM
> would read
<B
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>"/dev/ttyS0"</B
> for <B
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>COM1</B
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