Need "PC Mouse" driver for PCjr ..

I have recently acquired a "PCjr Mouse" by Mouse Systems, and I am looking for a device driver for it. The mouse looks to be a slightly modified version of the "PC Mouse". The neat thing is that it is an optical mouse. :-) The standard MS Mouse driver doesn't find the mouse. The "CuteMouse 1.8" driver hangs the machine up. An old (1992) Mouse Systems driver hangs the machine up too. The Colorpaint cartridge works with the mouse without a driver, so at least I know the mouse works. Do I even need a driver? I imagine older software doesn't need a driver, but newer software would. Then again, on a machine this old I don't think I have much of a problem. I'd like to have a working driver that recognizes the mouse, just in case. Thanks, Mike