Calculator with single-key cursor-left-shift clear function and

Details Calculator with single-key cursor-left-shift clear function and Calculator with single-key cursor-left-shift clear function and

1990-09-24

1992-04-28

Lee, Thomas

Boots, shoes, and leggings

36470901, 36470912, 36470904, 3642312, 364234, 364DIG2, G06F 302

Patent

active

051095181

ABSTRACT:
A calculator which can display not only numerical digits but also arithmetic operational signs and functional symbols. A display portion of the calculator has a numerical value display portion on its lower side and an expression display portion on its upper side, wherein a cursor appears only in the expression display portion. Any digit inputted from numerical keys is first displayed at the numerical value display portion, and such a digit is inputted into the expression display portion when a key for giving instructions to perform an operation is depressed. A CPU clears all of input numerical digits displayed at the numerical value display portion and shifts a cursor back to an end of a mathematical expression displayed at the expression display portion when a cursor-left-shift is operated. When a cursor-right-shift key is operated, the CPU deletes a digit located at the lowest position of the numerical value display portion. In short, duration of input digits on display at the numerical value display portion can be done easily and promptly only by operating the cursor-right-shift key or the cursor-left-shift key.

REFERENCES:
patent: 3610902 (1971-10-01), Rahenkamp et al.
patent: 4580235 (1986-04-01), Yamagawa
patent: 4625202 (1986-11-01), Richmond et al.
patent: 4821228 (1989-04-01), Wickes et al.
Hewlett-Packard, HP-41C/41 CV Alphanumeric Full Performance Programmable Calculator, Apr. 1982, pp. 16-19, 42-43, and 60-65.

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