> -----Original Message----- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Jon Elson > Sent: 25 November 2015 17:10 > To: gene...@classiccmp.org; discuss...@classiccmp.org:On-Topic and Off- > Topic Posts > Subject: Re: Replacing MicroVAX II PSU With a Modern PSU > > 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. >
Ah, I misread your earlier response, I thought you were saying something different. Regards Rob
