Programmable calculator including means for automatically processing imformation stored on a magnetic record member
US4330839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1979 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Jun 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An adaptable programmable calculator employs modular read-write and read-only memories separately expandable to provide additional program and data storage functions within the calculator oriented toward the environment of the user, an LSI NMOS central processing unit, and LSI NMOS peripheral interface adaptor capable of bidirectionally transferring information between the read-write memory and central processing unit and a number of input/output units. The input/output units include a keyboard input unit with a plurality of alphanumeric keys, a magnetic tape cassette reading and recording unit capable of bidirectionally transferring programs and data between a magnetic tape and the calculator, a seven-segment gas discharge display, and a 16-column alphanumeric thermal printer. The calculator includes switch means for selecting an auto start mode of calculator operation whereby, upon the application of operating power to the calculator, a program stored on an external magnetic record member is automatically loaded into the calculator read-write memory and execution of that program is commenced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.