I believe there is unmistakable iconographical evidence of a keyed 
monochord with all 'white keys' except a single black one for Bb. 
Don't have it to hand, but those familiar with literature on the very 
early clavichords and their immediate antecedents may remember the 
same thing.

I think it's B, though, not H.

o


>
>It is intersting that the I-VIII modes use (if discreetly, in III and
>VII) one of the modal computer's black notes, Bflat. This seems to be
>consilient ('jumping together') with the fact that german gives this
>note an own, non-derivative name - H
>
>And I wonder if there is any iconographic trace of a corresponding
>keyboard, that gives  H&B as a split 'white key' and only 4
>accidentals(?)


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