Re: save files -- MI400

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The save file object X'1901' is a high-level composite over the dump space
obect X'1390'.  The MI opcodes do asynchronous I/O to the dump space,
similar to asynchronous I/O to a device description or tape drive.  In
other words, post an I/O request, then wait on a keyed data queue until the
I/O completes.  The dump space data I/O is a copy (dump) of another object,
plus some security checksums.  The MI opcodes I used for dump space I/O
came from an old machine; they're blocked and omitted from the current MI
reference manual, and some of the templates have changed.

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