I'm not 100% sure it doesn't clear archive on some OSes, but it only gives RAM clears on OS 1.4 and I think OS 1.7.
When your calc crashes in an infinite loop, pull out the keypad, and insert it like the CAS/touch ndless 1>1 method used to do. Turn on the calc, and remove a battery while it's on. I personally guarantee it won't be in the loop anymore, but it might still clear your archive on some OSes, I think 2.0 does.
Still, it's a handy way to not lose a big project!