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Dual booting ProDOS and SOS



I'm having trouble building a disk image that I can use to boot both
ProDOS on an Apple II and SOS on an Apple ///.  Looking through the
archives, I understand what has to be on block 0 and block 1.  And I
have a few disks that are formatted for ProDOS with both boot blocks
in place.  But it doesn't seem to work to just copy over SOS.KERNEL,
DRIVER and INTERP to such a disk and boot it in a real or
virtual ///.  Is there an example disk image out in the wild that is
thusly bootable in both type of machines?