Data processing apparatus with algebraic memory operation and entry

Abstract

A data processing apparatus having a plurality of preprogrammed functional operations and at least one user accessible memory includes a generalized input sequence for combining functional operations with data storage in one of the user accessible memories. In the case where a number of user accessible memories is provided, memory entry is enabled by a store input followed by an input designating the memory while a memory recall operation is enabled by a recall input followed by a memory designation input. The algebraic memory operation and entry sequence requires entry of the store input, the desired operation input and the memory designation input. If a unary operation is selected, the selected operation is performed on the data stored in the output indicator memory or alternately on the data stored in the designated memory and the result is stored in the designated memory. If a binary operation is selected, the selected operation is performed using the data stored in the designated memory as the first operand and the data stored in the output indicator memory as the second operand, and the result is stored in the designated memory. With modifications this entry sequence can also be used to perform combined operations and memory entry for an apparatus having only one user accessible memory.