Recent commentary on porting led me to read the article on porting UNIX to S/370 (https://www.bell-labs.com/usr/dmr/www/otherports/ibm.pdf) to support 5ESS development because the existing PDP11s were being overwhelmed. I confess to not having this read this before and find it interesting. Any recollections from anyone on the matter. And whatever happened to it? N.