Dead middle button in Agiler 3 button mouse

[Eyal Lebedinsky <eyal@eyal.emu.id.au>]

Just got a basic Agiler serial mouse (AGM1904). It works fine but
the middle button does not respond.

I used the spec:

Section "Pointer"
   Protocol        "Microsoft"
   Device          "/dev/mouse"
   BaudRate        1200
   Resolution      400
   Buttons         3

If I add ChordMiddle or Emulate3Buttons then I can get equivalent
action from the other two, but that's not what I want.

The mouse box says: resolution 400DPI, Mode: Microsoft / Mouse system.
You need to hold down a button at power-up to go into Mouse System (I
guess
they mean Mouse Systems?) which I did not want (do i?).

Help appreciated.

--
Eyal Lebedinsky		(eyal@eyal.emu.id.au)