If you want to see some software that will work on a ROM 01
but not a ROM 03 here is a list that I know of.

     Orignal Apple IIGS Demo (Apple 2 Disk version)
     Dungen Master (First Version)
     Photonix (FTA First Version)
     Modelue (FTA First Version)
     Alien Mind (I'm not sure on this.  I keep thinking the first
version didn't work on a ROM 03)

      There was some other games that didn't like the ROM 03 as well,
but some of those was just the System Disk that they came with.  If you
ran the program booting with a differnt System Disk you where able to
run the game/program.  However those up top I have not been able to run
on my ROM 03.  I have modified versions (execpt for the GS Demo) that
do work on a ROM 03 though.

    As for the System Software for the Apple II GS, I will did up the
Apple CD Dev that has all them on it and tell you wants on it.  It has
from 1.0 (yes 1.0) to 6.01 on it.

    -Lockar