I must confess I'm intrigued by those early A-100 prototypes. There's a sliver of information (old scans of flyers and some reporting) over at http://machines.hyperreal.org/manufacturers/Doepfer/A-100/

I could have sworn I saw actual photos of the prototype modules somewhere, maybe your blog, Pierre But couldn't retrace my steps just now, alas...

Doepfer, if you have any old flyers, leaflets, manuals, service notes, schematics or anything you'd like to be preserved, let me know. :)

This is everything I've managed to archive so far: https://archive.org/details/synthmanuals-doepfer

All the best,
Zoë.