Turn your old compact Canon camera into a high speed photography camera with Canon Hack Development Kit
I bypass the battery pack and make the camera run on a power supply, as the CHDK software takes a lot of CPU power, I also add a fan to cool down the CPU and optics.
Hacking the battery pack into power supply requires a 10K resistor between negative and middle contact point of the battery connector. Check out my other teardown and reverse engineering articles.
Temperature measurements to locate the DIGIC2 processor heating and it actually turns out that the optics heat up even more and will often be the limiting factor.