Programmable calculator including means for digitizing the posit

Details Programmable calculator including means for digitizing the posit Programmable calculator including means for digitizing the posit

1982-03-08

1986-01-21

Malzahn, David H.

Boots, shoes, and leggings

364710, G06F 313

Patent

active

045660727

ABSTRACT:
An electronic calculator includes modular read-write and read-only memory units, a central processing unit, an output display unit, an output printer unit, a keyboard input unit, and input/output interface circuitry for facilitating the connection of one or more peripheral input/output units, such as an X-Y plotter, for example, to the calculator. When the calculator is coupled to an X-Y plotter, the user may employ commands entered from the keyboard input unit to move the plotter pen to an arbitrary position on the plotter platen whose X and Y coordinates are unknown to him and to subsequently cause the calculator to determine and display the X and Y coordinates of that arbitrary pen position.

REFERENCES:
patent: 3602890 (1971-08-01), Colpitts
patent: 3809868 (1974-05-01), Villalobos et al.
patent: 4012725 (1977-03-01), Spangler et al.
patent: 4322816 (1982-03-01), Spangler et al.

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