On Feb 26, 2019, at 11:07 PM, J?rg Hoppe via cctech <cctech at classiccmp.org> wrote: Hi, most people dealing seriously with older PDP-11s have found means to monitor the UNIBUS traffic. My latest approach is www.retrocmp.com/tools/uniprobe UniProbe is a M9302 terminator, a LED display, a probe for logic analyzer. It can be mounted in Standard or Modified UNIBUS sockets. I'm ordering a batch of PCBs in a few days and will show this and other stuff (UniBone, BlinkenBone) at VCFPNW in Seattle. https://vcfed.org/wp/festivals/vintage-computer-festival-pacific-northwest/ best regards, Joerg