I know I've run Panther on a 640x480; but I don't know about Tiger. It could just be that Tiger really does need more than that, and Tiger may ignore the old fashioned Mac sense lines.

I'm just having a hell of a time getting Tiger onto my clamshell iBook at the moment... My external USB DVD drive *WILL* boot the Tiger DVD, but of course a stock Tiger DVD will refuse to install. Booting into 9.2.2 or 10.3.9, XPostFacto won't let me select the Tiger disc to boot from, saying it's not on a bootable device!