25 Nov
2015
25 Nov
'15
9:09 a.m.
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