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Wang LOCI-2 Circuit Board 1406A

The 1406A board contains the ten digit A (Accumulator) register that is
used for basic addition and subtraction operations, as well as the
control circuitry for addition and subtraction. The A register
consists of a total of 40 flip-flops (80 transistors and associated
components) that are arranged as a ten digit shift register, with each
digit represented by four flip-flops, with digits stored in binary-coded
decimal form. Also included is the logic for keeping track of the sign
and decimal point location of the number in the A register. There is
also circuitry to properly align the decimal points when performing addition
and subtraction. The board also contains some of the logic relating to
the addressing of the memory registers of the LOCI-2.