> Ok, so it is good. I am surprised you can pass tests with such > a simple device. > > Peter Ah, but I haven't proved that with ent.exe yet ;-) I stand by my claim that a random number of pulses with random timing between them is all you need. I'd feel pretty confident going head-to-head with a s/w PRNG. The research I did beforehand proved to me that an unpredictable external event was the only way to go -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.