A card system for an electronic parking meter. At least one card is provided and has an electrically erasable programmable memory containing data therein. At least one coin slot in the electronic parking meter is provided and the card has at least a portion thereof dimensioned to fit into the coin slot. A card switch in the coin slot is activated only by the card and provides a card switch signal. A microprocessor in the electronic parking meter receives the card switch signal and in response thereto supplies power for the card and exchanges data with the card. An interface circuit connects the microprocessor to the card. The portion of the card has electrical contacts for engagement with electrical contacts of a power supply and with the interface circuit.
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