Patent ID: 7305505

Claim:
A memory card system, comprising: a first enclosed electronic card having given dimensions along at least one edge thereof, comprising: re-programmable non-volatile memory within the card, a plurality of external conductive contacts accessible from outside of the card at at least first, second, third and fourth locations along one edge thereof that are connected to respective power, ground, command and only one data lines of the memory therewithin, and a second enclosed electronic card having said given dimensions along at least one edge thereof, comprising: re-programmable non-volatile memory within the card, a plurality of external conductive contacts accessible from outside of the card at at least first, second, third, fourth and fifth positions along said one edge thereof that are connected to respective power, ground, command and at least first and second data lines to the memory therewithin, and a field in a register readable from outside the card through at least one of the external contacts that designates whether data are transferred to the memory therewithin through the contact in only the fourth position or through the contacts in at least the fourth and fifth positions, wherein the first, second, third and fourth positions of the contacts of each of the first and second cards are the same relative to their respective one edges, whereby the second card is compatible with the first card.