I'm using Mac OS 9.2.2, but I imagine it'll work even with System 7 (I could try tomorrow, as I still have an easily-bootable version of it... I didn't stop using System 7 until about 2004!). Like I said, it's just modification of the video mode parameters in that special video driver that works with System 7-9. And yeah, it goes way beyond any of the resolution drivers I've seen before, basically what Switch Res X supports on OS X. I could also add resolutions for 1440x900, 1600x1200, etc. The first thing is to have others try it on their displays. Anyone actually using one of the mentioned PowerMac machines with a widescreen or fairly large LCD?