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this post was submitted on 11 Jul 2024
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I graduated college in 1990 and one of the places I interviewed for a job was with the Electric Boat division of General Dynamics. They build the submarines for the US Navy.
During my interview they told me that the computers on the current generation of subs were programmed by punch card. The punch cards were sent to the one contractor that had the ability to convert them to the magnetic tape actually used to load them onto the subs systems.
Perhaps by now they have indeed upgraded from punch cards & mag tape to floppy disks of some sort…
I saw some CNC controllers in the 90's that were loaded up using paper tape - essentially punched cards but in a tape format.
The admins said they had to load a machine maybe once a year, so no reason to switch to anything else.
These things ran non-stop for years at a time, in a rough environment. They had added some kind of networking (not sure what back then, may have just been a serial connection) so they could send jobs to specific CNC machines using a desktop on the network.