@Billchase:
LR problem:
Some PowerPC-CPU's (notably 233 MHz 604) had a problem that the LR register sometimes randomly flips a bit (one of the upper bits) causing a wild jump into some uninitialized area. There is a software fix available that detects this and corrects the problem in software (since no Amiga has RAM that high, an LR with that value is impossible.
On your problem, *do* try to downclock your memory to 70NS, at least for a test, and *do* try to remove your mainboard memory. This may make all the difference, especially with the 70ns, since some RAM modules have difficulties working together at 60ns, even though they're all flagged as 60ns.
