Calculator data storage system

Claim 1

An electronic calculator system of the type implemented on a plurality of semiconductor chips, including a plurality of separate data registers for storing in bit-parallel, digit-serial format a plurality of multi-digit words of coded information, primary timing means for producing timing signals for sequentially addressing the separate data registers one digit at a time from least to most significant digit, flag output means for providing status information relating to a calculator mode indication and an addressing indication, data input/output means for transmitting the multi-digit data words to and from the separate data registers, the calculator system further including at least one data register chip comprising: a. a plurality of auxiliary registers for increasing the storage capacity for the multi-digit data words; b. control logic means responsive to the status information from the flag output means for generating first and second operations signals and a synchronization signal; c. storage means coupled to the data input/output means for storing a first multi-digit data word transmitted from the separate data registers, the first data word comprising an input/output operation command portion and a register select portion for selecting a particular register of the plurality of auxiliary registers to be addressed; d. selection means operatively connected to the storage means and responsive to the first data word for selecting a particular one of the separate storage registers and operatively connected to the control logic means and responsive to the first and second operation signals for data input or output, respectively; e. register timing means for providing timing signals corresponding to the timing signals of the primary timing means for addressing the auxiliary registers corresponding to the timing signals of the timing means, in response to the synchronization signal from the control logic means; and f. data routing means connected to the data input/output means for transmission of data to and from a selected one of the plurality of auxiliary registers, through the storage means.