With the help of a sighted neighbor I was able to sus out the following
about the option key startup options. This may be useful for others wanting
to have a degree of certainty when booting by this method
Pressing and holding "option key" for a good, healthy 10 or 15 seconds after
powering on brings up a drive selection screen with (in my case at least)
the internal Macintosh HD highlighted. There is an upward pointing arrow
below the currently selected item.
Pressing right arrow once brings the highlight to the Recovery partition,
and a second right arrow brings me to the first (and only) external bootable
drive.
pressing return here boots the mac from the external bootable drive.
The selection highlight "wraps" back around to the first item in the list of
drives after the last is reached, so it is important to know how many
bootables you have - you can't rely on just slamming the cursor to the right
and pressing enter to boot from the last item.
I imagine if there was more than one external bootable partition these would
be listed - but in what order I do not know.
In my case at least, I now know with certainty that two right arrows and a
return key will boot from my SuperDuper bootable clone from the drive
selection screen. A little educated guesswork and I imagine anyone could
figure out the order of their system bootable drives as well.
<--- Mac Access At Mac Access Dot Net --->
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