Mouse replacement in Hdd installation

I have a system installed from knoppix to HD.

How i configure a mouse replacement?, from serial mouse to ps/2 mouse.

I think dpkg-reconfigure xserver-xfree86, but i don't know if Debian configure system know about knoppix initial configuration and lost changes.

Here are the relevant sections from my XF86Config-4:

Code:

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Section "ServerLayout"
        Identifier    "XFree86 Configured"
        Screen      0  "Screen0" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "PS/2 Mouse" "CorePointer"

/snip/

Section "InputDevice"
        Identifier  "PS/2 Mouse"
        Driver      "mouse"
        Option      "Protocol" "IMPS/2"
        Option      "Device" "/dev/psaux"
        Option      "Emulate3Buttons" "true"
        Option      "Emulate3Timeout" "70"
        Option            "SendCoreEvents"  "true"
        Option      "ZAxisMapping"    "4 5"
        Option      "Device"  "/dev/mouse"
EndSection

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