Display device for a programmable electronic calculator

Details Display device for a programmable electronic calculator Display device for a programmable electronic calculator

1986-01-06

1988-01-05

Malzahn, David H.

Boots, shoes, and leggings

364709, G06F 3147

Patent

active

047180293

ABSTRACT:
A display device for a programmable electronic calculator comprises an input device for inputting the contents of a display to be displayed in the display device, a sheltering display memory for storing the contents of the previous display for sheltering when the display device is adapted to provide a new display, and a circuit for extracting the contents of the sheltering display memory so that the display device displays the contents sheltered, again. In another form of the present invention, a programmable electronic calculator comprises a keyboard containing a plurality of key switches, a key sequence setting device for setting a key operation sequence to one of one or more key switches selected from the plurality of key switches, a display device for displaying a specific item, a display enabling device activated to enable the display device to display the specific item and a display controller responsive to the display enabling device for permitting the display device to display a symbol representative of the key operation sequence.

REFERENCES:
patent: 3839630 (1974-10-01), Olander, Jr. et al.
patent: 4009379 (1977-02-01), Musch
patent: 4075679 (1973-02-01), Christoper et al.
patent: 4145742 (1979-03-01), Olander, Jr et al.
patent: 4145752 (1979-03-01), Olander, Jr. et al.
patent: 4177520 (1979-12-01), Meff
patent: 4181965 (1980-01-01), Olander, Jr. et al.
patent: 4301511 (1981-11-01), Shimizu et al.

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