Casio magnetic data cards for the Pro fx-1

[Didier Lachieze]

I've recently acquired a Casio Pro fx-1, one of the first Casio programmable calculators and the only one with a card reader. I would like now to get some magnetic cards for this model.
I've found a topic in the old forum archives from someone who had such cards but I don't know how to contact him: OT: Casio magnetic cards

So if anybody can help me either to contact Juergen (CH) or to find some of these cards it would be great.