Casio magnetic data cards for the Pro fx-1

[ijabbott]

(04-14-2019 01:43 PM)Didier Lachieze Wrote:  On the original Casio magnetic card, the bottom part where the black stripes are located is transparent. So I suppose there is a LED on one side of the card tray and a photodiode on the other side so when you swipe the card the alternance of the black stripes with the transparent part of the card creates the clock signal.

There don't seem to be enough stripes for a bit clock unless the data capacity is really small (about 10 bytes?), which is why I thought they were more to do with speed measurement.