[inigyou]

That's probably because the OS itself didn't have great defenses, right? We have permissioned virtual memory now.

[pjmlp]

It surely did, MMU were already a thing.

The customers that still buy such systems, care about security as the feature above anything else.

As you can see, the marketing is all about security.

https://www.unisys.com/product-info-sheet/ecs/clearpath-mast...