Python discusses deprecations

Posted Dec 9, 2021 13:01 UTC (Thu) by Wol (subscriber, #4433)
In reply to: Python discusses deprecations by eru
Parent article: Python discusses deprecations

I believe that old IBM mainframe code for S360 (or even earlier) may well still be in production use on the latest zXXX mainframes.

That was one of IBM's selling points - every upgrade came with a VM for running earlier code - and that VM would run an earlier VM - turtles all the way down.

So your S360 code would be running on an S360 emulator, which would be running on an S370 emulator, which would be running ... on a z800 emulator which would be running on z9000 hardware.

It would be nice if we had something as reliable for x86 ... given the way hardware speed has increased, chances are your program is still running faster on top of the stack of emulators, than it would have done on the original hardware.

Cheers,
Wol