[shortlived]

Even more “insanity”:

z/OS (aka OS360 aka MVS) supports programs going back to the 60s and I just talked with a DE at IBM who is still using a program compiled circa Apollo 11 mission.

[rahen]

That's common in the mainframe world. Unisys (ex Univac) still has its Dorado mainframes binary compatible with the Univac 1100 released in 1962.

[the_only_law]

I think I remember reading a while back that System/360 binaries can still run on modern Z/architecture mainframes.

[shortlived]

Yup, that’s the example I cited above.

[the_only_law]

Oops, missed that, I came in from the comments link.

[sillywalk]

I thought the Unisys mainframes have been running emulated on X86/X86-64 for a while? I assume they have some sort of binary translator.

[rahen]

Yes, you got it right. The Dorados now run a binary emulator on top of a microcomputer (x86_64) architecture, while IBM Z (itself essentially a 64-bit S390 arch) kept a mainframe configuration.

[sillywalk]

What's a DE? Also did they tell you what the program did?

Other systems that will run or automatically translate > 30 yr old binaries:

- I believe IBM i on POWER {i5/AS400} will run stuff from System 38 (1980).

- HPE Nonstop (aka Tandem Guardian ) on X86-64 will run or translate binaries from the original proprietary TNS systems (late 1970s) and MIPS systems (1991).

[rahimnathwani]

Distinguished Engineer?

[shortlived]

Bingo.