> On Oct 25, 2016, at 12:40 PM, allison <[email protected]> wrote: >> >> Also, I think in a previous email you mentioned that the UNIBUS is 240ohm. >> It’s not. >> It’s 120ohm. > My book says no. Qbus is for sure 120. >
Section 5.2.5 of the PDP-11 UNIBUS spec: A Unibus segment must always have a Unibus terminator at each end of its 120-ohm transmission path. So, I don’t know how you get a value of anything other than 120-ohms given that statement. TTFN - Guy
