Magnetic Data Card (1975-1976)

This is a unique concept from Casio and was only used for 1 calculator "The Pro FX-1"

The cards are credit card sized and were sold in a box of 10 pieces.
Simply slide in the card in the motorless recording head of the Pro FX-1 calculator and you are ready to programme calculation.

Cards can be used over and over again and special anto-magnetic strip protectects the programmes from being accidentally erased.
Also makes duplicates of existing cards and contents. Operating is based in the FORTRAN system.

There is a number on the cards and I know only 3 model numbers (402,403,112) If you have other numbers please contact me..

Thanks Ledudu to notify he has another set of cards with numbers 201.

So 4 different sets are known (112, 201, 402, 403)