[wolf550e]

I know of an S/360 assembly code base that (as of a decade ago), still ran code that assumed 24 bit address space and used 31 bit pointers with tags stuffed in the unused 7 bits. So it had to run in the lowest 16MB of memory, on a 64-bit machine. I don't think they had the budget to rewrite that subsystem to fix it. So yes, new hardware, but some of the legacy problems in the software run very deep.