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US3859514A
Expired / Lapsed
US
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Arithmetic operation and trailing zero suppression display unit
Assignee: Casio Computer Co Ltd
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Filing: 1973-05-31
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Granted: 1975-01-07
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Expires: 1993-05-31
Abstract
Abstract An arithmetic operation and indication apparatus of the double length system which comprises a Y register for storing operators and an X register including a first and a second half memory section each provided with the same number of digit positions as those of the Y register and having the first half memory section stored with operands, wherein the so-called underflow system is adopted to indicate the result of arithmetic operation and suppress the insignificant digits which might otherwise appear in the blank digit positions following the lowest order digit of a significant number finally obtained by said operation, starting with the insignificant digit of lowest order included in the second half memory section.
Inventors
- 👤 Toshio Kashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:47
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/14; G06F3/1407; G06F15/00; G06F15/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
331 words
An electrically actuated indication apparatus for storing and displaying numerical data, said numerical data including a head portion of data and a tail portion of data, comprising: indicator means including a plurality of digit indicators for displaying numerical data; memory means coupled to said indicator means and having a greater number of digits of storage capacity than the number of digit indicators of said indicator means, said memory means being adapted to store said numerical data; means for shifting said numerical data in said memory means such that the most significant digit of said numerical data coincides with the most significant one of the digits of said memory means; means for ordering said indicator means to indicate the digits in the head portion of said numerical data shifted in said memory means by said shifting means, said digits in said head portion of data being identical in number with the number of digits of said indicator means for displaying said numerical data; means for generating an order signal which orders said indicator means to display the numerical data in the tail portion of said shifted numerical data instead of the head portion; means responsive to said order signal for ordering said indicator means to display the digits in the tail portion of data successively first at the most significant digit position and at the succeeding ones so that the most significant one of the digits in the tail portion of data may be indicated following the least significant one of the digits in the head portion of data, the display of which was switched off by said order signal; discriminating means for distinguishing the least significant one of the digits in the tail portion of said numerical data from the digits following said least significant digit; and suppressing means controlled by said discriminating means and adapted to suppress those digit positions of said indicator means which correspond to the digits following said least significant digit of the tail portion of data.
Claim 2
Dependent Claim
331 words
An electrically actuated indication apparatus for storing and displaying numerical data, said numerical data including a head portion of data and a tail portion of data, comprising: indicator means including a plurality of digit indicators for displaying numerical data; memory means coupled to said indicator means and having a greater number of digits of storage capacity than the number of digit indicators of said indicator means, said memory means being adapted to store said numerical data; means for shifting said numerical data in said memory means such that the most significant digit of said numerical data coincides with the most significant one of the digits of said memory means; means for ordering said indicator means to indicate the digits in the head portion of said numerical data shifted in said memory means by said shifting means, said digits in said head portion of data being identical in number with the number of digits of said indicator means for displaying said numerical data; means for generating an order signal which orders said indicator means to display the numerical data in the tail portion of said shifted numerical data instead of the head portion; means responsive to said order signal for ordering said indicator means to display the digits in the tail portion of data successively first at the most significant digit position and at the succeeding ones so that the most significant one of the digits in the tail portion of data may be indicated following the least significant one of the digits in the head portion of data, the display of which was switched off by said order signal; discriminating means for distinguishing the least significant one of the digits in the tail portion of said numerical data from the digits following said least significant digit; and suppressing means controlled by said discriminating means and adapted to suppress those digit positions of said indicator means which correspond to the digits following said least significant digit of the tail portion of data.
Claim 3
Dependent Claim
267 words
An electrically actuated arithmetic operation and indication apparatus for storing and displaying numerical data, comprising: an arithmetic operation means; a first register for storing first numerical data necessary for an arithmetic operation; a second register coupled with said arithmetic operation means and having twice as many digits of storage as said first register, said second register being adapted to store second numerical data necessary for an arithmetic operation; means for effecting the shifting of data in said second register to bring first the most significant digit of said second numerical data and successively the remaining digits into arithmetic operation with the digits of said first numerical data in said arithmetic operation means, and thereby storing the results of the arithmetic operation first in the least significant digit position of said second register and successively in the digit positions preceding said least significant one; means for detecting the completion of the arithmetic operation and for shifting the results of the operation up to the most significant digit position of said second register; indicator means coupled to said second register and including a plurality of digit indicators and means for displaying the results of the arithmetic operation on said plurality of digit indicators; means for ordering said indicator means to indicate the results of the arithmetic operation such that the most significant digit of said results of said arithmetic operation coincides with the most significant digit of said indicator means; and suppressing means for suppressing the digits of said indicator means which correspond to those digits of said results of said arithmetic operation which follow the least significant digit.
Claim 4
Dependent Claim
267 words
An electrically actuated arithmetic operation and indication apparatus for storing and displaying numerical data, comprising: an arithmetic operation means; a first register for storing first numerical data necessary for an arithmetic operation; a second register coupled with said arithmetic operation means and having twice as many digits of storage as said first register, said second register being adapted to store second numerical data necessary for an arithmetic operation; means for effecting the shifting of data in said second register to bring first the most significant digit of said second numerical data and successively the remaining digits into arithmetic operation with the digits of said first numerical data in said arithmetic operation means, and thereby storing the results of the arithmetic operation first in the least significant digit position of said second register and successively in the digit positions preceding said least significant one; means for detecting the completion of the arithmetic operation and for shifting the results of the operation up to the most significant digit position of said second register; indicator means coupled to said second register and including a plurality of digit indicators and means for displaying the results of the arithmetic operation on said plurality of digit indicators; means for ordering said indicator means to indicate the results of the arithmetic operation such that the most significant digit of said results of said arithmetic operation coincides with the most significant digit of said indicator means; and suppressing means for suppressing the digits of said indicator means which correspond to those digits of said results of said arithmetic operation which follow the least significant digit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |