This may be old news -- it was new to me, though.
https://suddendisruption.blogspot.com/search/label/Booting%20Sage%20Computer
I'm not really familiar with SAGE machines. They were not as
well-known in the UK, I think, being upmarket from the Apple ][ and
IBM PC, both of which were eye-wateringly expensive by UK standards of
the time.
Also, they were terminal-based things and even back then I was
interested in boxes with graphics. :-)
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