Thanks everyone for the responces.

The mpu reset circuit with rc network sounds interesting. I wonder if an rc
network could be applied directly to the mpu reset input that will oscilate
the reset pin, Hmmmmm.

The circuit will be powered from a 120 Hz wall transformer (US).

100 Hz is the minimum. Higher speed is okay but I want it as slow as
possible. It will control an optical display using the memory as a sort of
'paper tape' that has the display patterns 'punched in', like a player
piano. The clock will control display speed. I need all the memory for data
and have only 12 bytes or so left for code.

120 Hz from the mains would be fine but then I need to rectify and filter
and regulate for MPU power.

Thanks again.

John

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