On Aug 30, 1:01, cvisors(a)carnagevisors.net wrote: Maybe this will help: there are basically 4 mice that have been used on SGIs. Some early 4D's used an optical mouse made by Mouse Systems, rather rectangular in shape; it's possible to convert some old Sun optical mice to SGI use and vice-versa (see the 4DFAQ aka "This Old SGI" for details). BTW, having the mouse work correctly on one axis but not the other is a common symptom of using a mouse pad with the wrong line spacing. Some people have in the past incorrectly attributed this to "one of the LEDs not working", but in fact the perceived non-illumination is because one LED is visible red and the other is infrared. Most Personal Irises and the original Indigo (both R3000 and R4000 models) use a Mouse Systems mechanical mouse, which has a 6-pin miniDIN that plugs into the keyboard. This is basically a serial mouse. It's a beige colour, same as the keyboard, with about 32" of cable, part no 9150800. Benjamin, are you sure you've not misread the last digit? I've checked half-a-dozen mice in case I had any variants... The Indigo^2, Indy, and later machines use a PS/2 type mouse, also 6-pin miniDIN, which plugs into the machine (which has two PS/2 ports, one for the mouse and one for the keyboard). The first ones were made by Mouse Systems and look just like the earlier Indigo serial mice, except that they are normally granite (grey) in colour, have a much longer cable -- about 105" -- and a different part number: 063-0001-001. The very earliest ones, however, were beige (the earliest Indy keyboards were beige). Later Indys, and O2/Octane/Origin/Onyx2 and the like, were sold with a PS/2 mouse made by Logitek. It's a rebadged 3-button Pilot mouse (equivalent Logitek type M-S35), also granite coloured, part no 063-0009-001. -- Pete Peter Turnbull Network Manager University of York