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Regular readers of this column may have noticed that I have a fondness for new takes on old technologies. So you won´t be surprised that when I came across Lee Hart´s Membership Card kit, I leapt at the chance to build it. The Membership Card is a modern version of the 1976 Cosmac Elf. The Elf was an influential early microcomputer built around RCA´s CDP1802 processor. What may be more surprising is that the Membership Card might be just the ticket for modern makers looking to build microcontroller-based devices that can run for a year on a few AA batteries.