25 Oct
2016
25 Oct
'16
1:34 p.m.
On Oct 25, 2016, at 12:40 PM, allison <ajp166 at
verizon.net> wrote:
OK, re-reading the first part of section 5.2.5, it?s pretty clear that the Unibus
is 120-ohm:
A bus terminator is defined as a Unibus element or part of an element containing
a resistive network which connects to the end of a Unibus segment and matches
the 120-ohm characteristic impedance of the Unibus transmission path.
Given that it?s hard to see that the impedance of the Unibus is anything but 120-ohms.
TTFN - Guy
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.