There's current IBM hardware out there still running code that was last *compiled* in the 1990s. After generations of operating system and platform architecture changes. Through dozens of layers of abstraction and compatibility shells. MS does a GOOD job of this, but IBM is better.
Anyone who's written assembly for mainframes has interacted with both the most ancient still-in-production software stack and the most modern. Record storage and access is basically the same as it has been for 50+ years despite disks having been introduced and then reworked at least once.
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