Electronic calculator or digital processor chip with separately

Details Electronic calculator or digital processor chip with separately Electronic calculator or digital processor chip with separately

1974-11-19

1976-11-09

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

3401725, 340324R, G06F 314, G06K 1518

Patent

active

039913066

ABSTRACT:
An MOS/LSI semiconductor chip for providing the functions of an electronic calculator or digital processor includes a data storage RAM, a ROM for program instruction storage, an arithmetic unit for performing operations on data, and control circuitry for defining the functions of the machine in response to instructions from the ROM as well as conditions in the machine and inputs from external. Input and output terminals are provided, as for keyboard input and display output. The operation is digit oriented in that an instruction accesses one digit of the RAM. One set of output terminals may be used for sequentially scanning the display digits and the keyboard matrix, while another set of output terminals may provide segment outputs to the display. The two sets of output terminals are separately controllable. The terminals going to the display digits can be actuated in any order, not necessarily associated with any particular digit being applied to the segment outputs. The data to both sets is latched, so the machine can execute other instructions while a given output subsists.

REFERENCES:
patent: 3755806 (1973-08-01), Bunting
patent: 3781852 (1973-12-01), White et al.
patent: 3800129 (1974-03-01), Umstattd
patent: 3858197 (1974-10-01), Shimizu
patent: 3863060 (1975-01-01), Rode et al.

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