Oh okay, that's great to know. I'm glad I have some extra durability.
Now, not to sidetrack anybody too much, but I need to troubleshoot my 600xl now.
After hooking up my power supply, I booted up with a black screen. (I wasn't expecting it to work immediately after 30 years in storage, but a man can dream.)
I used this guide http://atari.boards.net/thread/893/black-screen-problems-fix-checklist. I reseated all main ICs and tried the other steps, still a black screen.
From my troubleshooting skills and basic Atari knowledge, I am guessing that it has bad RAM. How close would I be with that assumption?