hmmm... i swear Rodophe recommended EDO. I guess i might have gotten mixed up there. Also, I've tried two different SIMMS and both cause problems.
Let me emphasize that not only do i get the little screen glitches (which i don't really notice) but that the glitches are accompanied by file errors and i'm now positive that YES it is the ram that is the problem since when I use the old atari 4mb ram that problems go away.