Ok, well my bad. You could always download TechTool Lite from some site and try it. I think they have it on system7today.

or browse ftp://coius.dyndns.org and look for "Mac Test Pro" I know I shouldn't link to it, but it was made for the G3 systems (powerbook/iBook/imac) but specifically for the laptops. Run that, they have a memory tester in it. it's bootable with OS 9 on it (but you can't copy the OS 9 folder and run from the drive).

They have some other things. It's esentially an over-glorified Apple Hardware Test disk that would be useful.