> > Considering DEC did something like this for the DWBUA, but with 4 > 30-pin cables (by necessity because of the BI backplane), is 2x60 pins
DEC (also?) made a board that brought the Unibus out on 3 40-way cahles. The 11/730 I am restoring originally had a Unibus expansion cabinet, and the arrangement was a board in the Unibus Out slot of the CPU with 3 off 40 pin Berg connectors on it (and nothng else). Then 3 cables (40 pin socket on each end) to a bulkhead panel with 3 40 way headers on it. That took a special screened cable with 3 40 way ribbon cables inside to another identical bulkhead, then 3 more cables to another PCB (different M-number, so perhaps there were connection differences) in the Unibus In of the expansion cabinet. I have removed that from my 11/730 as I just want a single-cabinet system, but of course have kept all of it. Didn't we have a thread on this a few months back? > more cost-effective than 4x30? Mostly, I'm curious about how much > 60-pin ends cost and the difference in cost between 2 lengths of Practically, I would not want to use 60 way connectors and cable. They are not as easy to get as the 40 way ones. [I've never seen a 30 way IDC socket. 34 way are common of course.] -tony
