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I believe it is 9V 400ma (you can use a higher current without harm but not a higher voltage). It will almost certainly be centre +ve. You can probably use a universal regulated supply with interchangeable ends to get the correct size plug.
the switch that I have is a 4 port, (http://www.cablegear.com/156752.html) and it uses a 9-volt, 400mA A/C adapter. I do know that this type of adapter can be found on most VTECH cordless phone cradles which also has the same size DC plug.
If your keyboard and this KVM Switch are both PS2 (from the picture I see the KVM Switch is PS2 and from the Internet searching for Scorpius -p7 trackball keyboard I see it can be either USB or PS2) the connections are straight forward.
Usually a 2 port KVM switch uses keystrokes to make the switch, they are usually "Scroll Lock" or rarely "Num Lock" -- press the key 2 times with about a second or less between presses. You may hear a BEEP from the switch indicating "it's hearing your request."
If other keyboards and mice won't work, it sounds like your KVM bought the farm. Does it have any power lights that come on? is it plugged into a live outlet? Are they PS2 ports or USB? PS2 ports don't like power surges. Is the device plugged into a UPS? Does the UPS have power or is is tripped? In a server room?