In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Tracy Allen wrote:

I agree with others that a psuedo random generator seeded from RTCC would be adequate for your game application.

I was pursuing the comparator idea as a curiousity.   Pursuing it a little further, I don't understand the need for the transistor. I was trying to minimize the amount of external parts required down to basically two resistors.  Why not just turn the comparator on and off via the comparator mode bits, CMP_B?  You could even use it then for other i/o.

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