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Electronic computing circuit for addn. and subtraction - has decimal point processing facility and requires programming with the number 1 only for both arithmetic operations
Electronic computing circuit for addn. and subtraction - has decimal point processing facility and requires programming with the number 1 only for both arithmetic operations
The programming circuit (35B) consists of a subcircuit (35c) including 12 simple flip-flops with AND, OR and NOT gates, a gate circuit (24) comprising eight 2-input AND gates, and OR gates (21,23), AND gates (22,25) and NOT gates (27,34). An additional flip-flop at the lower end performs a carry to pre-empt the figure 2 cycle of another pulse circuit whereby the minuend is subtracted from the subtrahend. The latter circuit has an additional output whereby another flip-flop is reset when necessary. USE/ADVANTAGE - The circuit need only be programmed with the number 1 even when two successive subtractions are necessary and lead to negative difference.
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