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Shortly after our 3270 terminal attaches to Hercules the VM system starts to boot, or “IPL” to use the IBM parlance.

Brilliant, I've wondered for a while now what my boss has meant every time he's told me that they're IPL'ing the mainframe and that I'll have to remount my exported NFS shares.

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"Initial Program Load", which actually makes more sense than "bootstrap".

If you had been around that generation of systems and toggled in a 30 byte program in hex or octal that loaded a paper tape or card deck that then loaded the actual OS, bootstrap seemed a reasonable term.

Bootstrap actually makes some sense when you're toggling in a loader on a machine that has a bunch of switches, it certainly feels like you're trying to lift yourself up by your laces rather than that you're loading an initial program.

http://oldcomputers.net/imsai8080.html

Oh, and one bit wrong and you can start all over again... the scary thing is that once you've done it often enough you start to remember the sequences the same way you remember how to play a piece on the piano, in your muscle memory.

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