Played a bit more. Found two so far unknown commands:
EE and EF. Maybe EE is to write the CIS.
Maybe EF is to verify the checksum of the CIS.

Many cameras and readers refuse to handle a SmartMedia
card with bad CIS, so it would be very useful to be able
to rewrite it.
I have succeeded in changing the CIS in a very roundabout way,
but cannot yet do this in an easily reproducible way.
Is it possible to change CIS? Or only parts of it?
I have changed the vendor name.

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