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 Title: |
US3720820:
CALCULATOR WITH A HIERARCHY CONTROL SYSTEM
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| Country: |
US United States of America
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| Inventor: |
Cochran, Michael J.; Sunnyvale, CA
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| Assignee: |
Tektranex, Inc., Beaverton, OR
other patents from TEKTRONIX INC. (565820) (approx. 2,035)
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| Published / Filed: |
1973-03-13
/ 1971-03-18
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| Application Number: |
US1971000125511
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| IPC Code: |
Advanced:
G06F 15/02;
Core:
more...
IPC-7:
G06F 7/38;
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| U.S. Class: |
Current:
708/490;
Original:
235/156;
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| Field of Search: |
235/156,159,160,164
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| Priority Number: |
| 1971-03-18 |
US1971000125511 |
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| Abstract: |
An electronic calculator in disclosed having a keyboard in which numbers and hierarchal mathematical instructions are entered to produce corresponding numerical and instruction signals to be operative to perform sequential calculations in accordance with mathematical rules of hierarchy. Instruction storage means are included with a plurality of storage sections, each storage section temporarily stores an instruction signal of a designated hierarchal level. Numerical storage means with a corresponding plurality of storage sections are also included to operate with the instruction storage means to temporarily store the numerical signals associated with the hierarchal mathematical instructions. A hierarchy control unit is provided to automatically transfer the contents of the instruction and numerical storage means to an arithmetic unit to enable sequential calculations to be performed in accordance with hierarchal rules of mathematics as each hierarchal instruction is entered in the calculator.
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| Attorney, Agent or Firm: |
LaRue, Adrian J. ;
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| Primary / Asst. Examiners: |
Botz, Eugene G.; Malzahn, David H.
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| Family: |
None
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First Claim:
Show all 20 claims |
1. An electronic calculator comprising:
- an entry unit for producing hierarchal instruction signals having a plurality of hierarchal levels of operation;
- an arithmetic unit for performing calculations in accordance with instruction and number signals applied thereto; and
- instruction and number signals applied thereto; and
- a hierarchy control system connected to the entry unit and to the arithmetic unit,
- said hierarchy control system including an instruction storage unit with a storage section for each hierarchal level of operation of the instruction signals, and
- said hierarchy control system including a hierarchy control unit responsive to an entered hierarchy instruction signal to sequentially transfer previously stored instruction signals from the instruction storage sections to the arithmetic unit in a predetermined order, and thereafter to transfer the entered instruction signal into a storage section for its
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 19 U.S. patent(s) that reference this one
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