Casio magnetic data cards for the Pro fx-1
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04-14-2019, 01:43 PM
Post: #20
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RE: Casio magnetic data cards for the Pro fx-1
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.
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