HP-65 1333A04841 restoration it doesn't work anymore ...

[teenix]

The trace I posted is what I would expect, held low while the power supply stabilizes and then when the 3u3 capacitor charges sufficiently, the output goes HI allowing the logic devices to start working.

The output should stay HI from then on.

On other Classic models this was from a clock driver and reset IC, (this may be internal in the 65 hybrid), in the 97 it is a simple transistor/resistor/capacitor circuit, Spice have internal logic resets.

Are you sure the trace was on the correct test point? I see yours oscillating which shouldn't happen.

If the Y axis (voltage) is the same for each model you tested, they are quite different from each other, even from the one I posted.

cheers

Tony