Can't get serial scroll mouse working on Fedora (worked on Redhat)

Hi all,

I have a Mitsumi Serial Scroll Mouse on COM1, I was always able to get
it working in Redhat 6.x and 7.x with the usual editing of
/etc/X11/XF86Config.

Now with Fedora Core 1, I can't get the scroll button (it's not actually
a wheel) to function.

Here is the relevant parts of XF86Config, could you tell me what I need
to fix?  

Thanks in advance, Beny



# XFree86 4 configuration created by pyxf86config
                                                                                Section "ServerLayout"
        Identifier     "Default Layout"
        Screen      0  "Screen0" 0 0
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "DevInputMice" "AlwaysCore"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "Microsoft"
        Option      "Device" "/dev/ttyS0"
        Option      "Buttons" "5"
        Option      "ZAxisMapping" "4 5"
        Option      "Emulate3Buttons" "yes"
EndSection


Section "InputDevice"
                                                            
#
# If the normal CorePointer mouse is not a USB mouse then
# this input device can be used in AlwaysCore mode to let you
# also use USB mice at the same time.
        Identifier  "DevInputMice"
        Driver      "mouse"
        Option      "Protocol" "Microsoft"
        Option      "Device" "/dev/input/mice"
        Option      "Buttons" "5"
        Option      "ZAxisMapping" "4 5"
        Option      "Emulate3Buttons" "no"
EndSection