[GingisK]

...old 7-track tapes...

Those were 9-track machines. The early ones were NRZI encoded and the later ones Phase Encoded. The PE machines could read/write the NRZI tapes.

[iamgalt]

Phew that’s old school. Cobol maybe even assembly language.

[algore]

at least they have mostly retired 8” floppies

https://arstechnica.com/information-technology/2019/10/air-force-finally-retires-8-inch-floppies-from-missile-launch-control-system/

I think British warships still use them