Updated power supply and the RTC card
The Altair Real Time Clock card allows for two independent real time clocks for interrupt generation. One clock is crystal controlled while the other is based on a presumed 60 Hz line frequency. This second clock is generated by a circuit that watches one of the S-100 unregulated voltages for a residual sinusoidal wave.
I was wondering: is it possible that the updated power supply is too good to have a sufficient residual 60 Hz signal for the original RTC circuit to work?
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