VAX 4000-100 QBUS cables

On Mon, Nov 28, 2016 at 19:53 +01:00, Pontus Pihlgren <pontus at update.uu.se> wrote: If I may jump in at the end of this thread, I am also interested in playing with the QBUS capability of my VAX 4000-100A which has the two 50-pin D connectors as discussed. I don't want to be able to use regular QBUS cards so I don't envisage the need for an expansion chassis. What I would like to do is to construct a simple experimental QBUS device which could enable the VAX to talk to the outside world in the way of a few output lines that could drive relays or something similar. Not having an expansion chassis means that I would not need to get the cables designed to connect to it and if I had the pinout of the D connectors, assuming it is not too hard to track down suitable connectirs, I could hopefully make up cables to connect directly to the experimental device. Can anyone suggest an existing, simple QBUS device that I could study the documentation of to figure out what a basic QBUS device needs to have and to give me some ideas on how to implement one? I appreciate that if I end up with a device which does not look the same as some existing QBUS device from a programming point of view, I will need to come up with suitable device drivers for it too. Please, no suggestions about drivers and receivers for the QBUS signals, I will review the many postings on this topic in the list archives. Regards, Peter Coghlan.