Adaptable programmed calculator including a percent keyboard ope

Details Adaptable programmed calculator including a percent keyboard ope Adaptable programmed calculator including a percent keyboard ope

1976-04-28

1980-01-01

Malzahn, David H.

Boots, shoes, and leggings

364709, G06F 748

Patent

active

041819667

ABSTRACT:
An adaptable calculator is provided by employing five MOS/LSI circuits interconnected by a multiple line bus system. They include (1) a read-only memory circuit group; (2) a control and timing circuit; (3) an arithmetic and register circuit; (4) a data storage circuit; and (5) an input/output (I/O) circuit. Input and output units include a keyboard input unit and an 18-column output printer unit for printing intermediate results of calculations, entered data, arithmetic operators, and diagnostic notes. The keyboard input unit includes a PERCENT key that may be employed in combination with any of four arithmetic operator keys. The calculator may be operated manually by the user from the keyboard input unit or automatically by a program written in user-level language and stored in a plug-in read-only memory unit (ROM), a plug-in programmable read-only memory unit (PROM) or a read/write memory unit associated with a plug-in magnetic card reading and recording unit.

REFERENCES:
patent: 3641329 (1972-02-01), De Sandre et al.
patent: 3654449 (1972-04-01), Boyce
patent: 3760171 (1973-09-01), Wang et al.
patent: 3839630 (1974-10-01), Olander, Jr. et al.
patent: 3863060 (1975-01-01), Rode et al.
patent: 3971925 (1976-07-01), Wenninger et al.

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