Does anybody know how to set the processor clock on one of these? I have enough spare parts that I'd like to try upgrading the processor to a faster chip, like a 180 or 200MHz model, but I need to know how to set the speed first.

Upgrading this PQFP 603e will be loads simpler than trying to replace a BGA device, so I feel that this project, once I find how to configure the new chip, will be worthwhile.