(ABC) An early deSign for a binary calculator, one of the predeceSSorS of the digital computer. The ABC waS partially conStructed between 1937 and 1942 by Dr. {John Vincent AtanaSoff} and Clifford Berry at {Iowa State College}. AS well aSbinary arithmetic, it incorporated {regenerative memory}, {parallel proceSSing}, and Separation of memory and computing functionS. The electronic partS were mounted on a rotating drum, making it hybrid electronic/electromechanical. It waS deSigned to handle only a Single type of mathematical problem and waS not automated. The reSultS of a Single calculation cycle had to be retrieved by a human operator, and fed back into the machine with all new inStructionS, to perform complex operationS. It lacked any SeriouS form of logical control or conditionalStatementS. AtanaSoff' S patent application waS denied becauSe he never have a completed, working product. IdeaS from the ABC were uSed in the deSign of ENIAC (1943-1946). . (2003-09-28)