Title: External register memory chip in a calculator system

Abstract: Disclosed is a calculator having a basic pair of semiconductor chips respectively providing memory and computational functions and a third chip in combination therewith providing additional register and memory capacity. The basic chip pair generates system timing signals, flag signals and control signals which address the registers on the third chip and allow data to be written there into via the input/output data lines and data to be read therefrom via the input/output lines. The specific functions are effected upon the occurrence of the flag signal concurrently with a preselected timing signal.

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Inventors: Cochran, Michael J. (Richardson, TX, US)
Grant, Jr., Charles P. (Dallas, TX, US)

Application Number: 423355
Filing Date: 1973-12-10
Publication_date: 1976-01-20
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Class(es): 708/139
Other Classes:
US Patent Ref:

3579201	May, 1971	Langley	340/172.
3623009	Nov, 1971	Ragen	340/172.
3631403	Dec, 1971	Asbo et al.	340/172.
3656131	Apr, 1972	Libby et al.	340/172.
3691538	Sep, 1972	Haney et al.	340/173.
3760171	Sep, 1973	Wang et al.	340/172.

Other Refs:
Primary Examiner: Shaw, Gareth D.
Assistant Examiner: Sachs, Michael C.
Attorney: Levine; Harold, Connors, Jr.; Edward J., Sadacca; Stephen S.