Before I go search the net, does anyone know if they make a "mouse" with a scroll button, that will plug into a "serial" type port? I bought one from wall mart with the round plug, then I bought an adapter from "Amazon" that would convert it to a "serial" port, but it would not work. I think it may have something to do with the "laser" on the scroll type verses just the "roll type" on the older models. I have an older computer and the mouse is getting very frustrating trying to use. I use the older computer just for a certain program that only requires reading, and the scroll would be nice.. thanks... steve