On 11/25/2015 11:01 AM, Robert Jarratt wrote:
My reading of the Qbus spec is that P OK and DC OK are active high. That diagram tells me that both control signals are driven the same way because the two circuits are identical except for the timing caps. When the power is OK the output of the inverters is low, so the transistors are off, presumably allowing the signals to float high. When the power is not OK, the inverters are high, turning on the transistors and shorting the signal to ground. But, I am no expert, and could have interpreted those circuits all wrong. Regards Rob
Yup, I read the circuit the same way.
Jon
