SunOS 5.8 and mouse setup

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http://www.unix.com – Hi everybody, hope you're fine :). I'm coming back to you one more time because I have a problem I can't solve (and spent already a lot of time looking for an answer on the internet). So, I have a Sun Blade 1500 x64 sparc arch with Sun OS 5.8 installed on it. I know, SunOS is out of date, but I need that specific OS version because I'm using Cadds software wich needs that version of SunOS. Everything just works fine with that machine, except for the mouse. It's a USB mouse with 2 buttons and a wheel. Left click and right click just work fine, but I can't get the wheel to work (or the midd (HowTos)