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Duo Decimal Numeric Code (DDNC) is a proprietary interpreted language that runs on the Duo Decimal computer built by Jack Eisenmann based on [https://www.microchip.com/wwwproducts/en/ATtiny84 Microchip's ATtiny64 picoPower® 8-bit AVR® RISC-based microcontroller.] Reference the [http://www.ostracodfiles.com/decimal/menu.html Duo Decimal site], especially the [http://ostracodfiles.com/decimal/guide.pdf Guide] and the  [http://ostracodfiles.com/decimal/emulator.html emulator] for further information.