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Regarding software longevity, IBM's z/Architecture mainframes are backward compatible descendants of the System/360 family (1964). DOS programs from 1981 can s
by musicale 2y ago
Regarding software longevity, IBM's z/Architecture mainframes are backward compatible descendants of the System/360 family (1964).
DOS programs from 1981 can still run on modern x86 PC hardware, natively or via virtualization. HP laptops and Dell n Series "no OS" machines can still run FreeDOS.
And of course emulation (DOSbox etc.) doesn't even require compatible hardware.
Regarding hardware longevity, as noted in other comments, many PCs from the 1970s (Apple II, CP/M, etc.) and 1980s (IBM PC and compatibles, Macintosh, etc.) are still functional today.