What would you be looking at doing? Most off the shelf safety controllers used in industrial applications that require certification (very few safety applications don't!) are dual processors with watchdogs to each from each to ensure that it all behaves according to plan.
If you want to certify this application for use then there is a very long road ahead to get certification to the relevant standards.
I would have an interest in such a discussion. I still build with them and have since the 70s. Still have handfuls of them to play with. Have made several dev. boards also.(I realize this is a very old post)
