> On Oct 21, 2016, at 11:41 AM, Paul Koning <[email protected]> wrote: > > >> On Oct 20, 2016, at 6:05 PM, Noel Chiappa <[email protected]> wrote: >> >>> From: David Bridgham >> >>> the right threshold voltage to meet the receiver spec >> >> The UNIBUS spec says the 4 crucial receiver parameters are input thresholds >> (high and low), and the input currents (high and low); the crucial >> transmitter parameters are the output low voltage (at 50 mA sink), and >> the output high leakage current. > > Where did you find those specs? I see a Unibus Spec on Bitsavers, but it > doesn't appear to mention the electrical specs. >
They exist in various DEC handbooks. I don’t recall which one had them. The specs are fairly stringent in order to meet the max unibus bus lengths (my 11/40 is close to max). TTFN - Guy
