I come back to this post as buying new RAM sticks brought back the issue.
I have made some investigations, I tried 2 different 9500 motherboards, I tried many different memory sticks and it looks like the applescript engine on system 7 bugs when there is more than 512MB of RAM in any case.
The problem is that each time I made it bug with too much RAM, even after removing the excess RAM I had to re-install the system to make it work again.
Everything works fine under Mac OS 8 and 9 so it is something to do with 7. (7.5 and 7.6 have the same result)
There may be a fix or something I missed here because the 9500 and the 9600 officially supported more than 512MB of RAM and both shipped with system 7.
I have made some investigations, I tried 2 different 9500 motherboards, I tried many different memory sticks and it looks like the applescript engine on system 7 bugs when there is more than 512MB of RAM in any case.
The problem is that each time I made it bug with too much RAM, even after removing the excess RAM I had to re-install the system to make it work again.
Everything works fine under Mac OS 8 and 9 so it is something to do with 7. (7.5 and 7.6 have the same result)
There may be a fix or something I missed here because the 9500 and the 9600 officially supported more than 512MB of RAM and both shipped with system 7.