On Jan 19, 11:19, David Holland wrote: You might be able to get a non-optical mouse from an Indigo or something of that vintage and change the plug, or make an adaptor. AFAIK, the Sun optical mice were made by Mouse Systems, and so were the older SGI mice. The 4DFAQ (aka "This Old SGI") has some instructions to convert a Sun mouse for an SGI. I'm not sure what effect the modification has; it could be baud rate. The Sun mice are 1200 baud, while SGI's were 4800 baud, and of course Sun use 0V/+5V while SGI used +/- 5V (roughly, it's more-or-less RS423 levels). There are also different protocols; SGIs use 5 bytes, and I think Mouse Systems standard mice used 3. Dunno about Suns. Another thing you might look out for is an older Sun non-optical mouse. I used to hate the optical ones (because of the limitations of the pad) and was delighted to find that Sun made an alternative, around the time of the early Ultras and later Sparcstations. -- Pete Peter Turnbull Network Manager University of York