> 3. if you need real randomness (different each time you reset the PIC)
> use a user input, for indstance the time a key is pressed modulo 256 us.

Timer 0 based random number generators also seem to have this
characteristic at least sometimes, although I'm not sure exactly why.  My
HAL project (http://www.embedinc.com/pic/hal.htm) contains a random number
generator to select the sound snippet to play, when to play it, and when
and how to shift the "eyes" around.  The same unit will do a different
sequence every time it is powered up.


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