Adaptable programmed calculator including automatic decimal poin

Details Adaptable programmed calculator including automatic decimal poin Adaptable programmed calculator including automatic decimal poin

1976-04-28

1979-05-29

Malzahn, David H.

Boots, shoes, and leggings

G06F 302, G06F 312, G06F 314

Patent

active

041569210

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. An optional LED display unit may be plugged into the calculator mainframe. The keyboard input unit includes an AUTO DECIMAL POINT key for selecting an automatic decimal point mode of calculator operation in which the calculator automatically places the decimal point at a specified location in all entered data. Thus, the operator need not manually enter the decimal point in entered data. The calculator may be operated manually by the user from the keyboard input unit or automatically by a program stored in the calculator memory.

REFERENCES:
patent: 3405392 (1968-10-01), Milne et al.
patent: 3546676 (1970-12-01), Ragen
patent: 3588841 (1971-06-01), Ragen
patent: 3634666 (1972-01-01), Ragen
patent: 3654449 (1972-04-01), Boyce
patent: 3657529 (1972-04-01), Hamano
patent: 3760171 (1973-09-01), Wang et al.
patent: 3839630 (1974-10-01), Olander, Jr. et al.
patent: 3971925 (1976-07-01), Wenninger et al.

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