Casio magnetic data cards for the Pro fx-1

[blackjetrock]

(04-14-2019 11:41 AM)Didier Lachieze Wrote:  

(04-14-2019 11:37 AM)ijabbott Wrote:  I wonder what the black stripes on the bottom edge of the card are for? They must be for an optical sensor, but what is the optical signal used for?

I suppose that these black stripes are used to generate a clock signal used to synchronize the read or write operations.

Yes, I'm pretty sure they are. There's an opto sensor in the top part of the calculator that senses through the card. I've tried putting stripes on an old credit card to see if I can make some cards, but it didn't work. I think this is because the cards need to be low coercivity and the credit cards are high coercivity. I've got some lo-co cards coming so I'll try it with them.

Andrew