Programmable calculator employing a read-write memory having a movable boundary between program and data storage sections thereof
US4089059A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1975 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | Jul 21, 1995 |
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 an 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 modular read-write memory includes a movable boundary between a program storage section thereof and a data storage section thereof to permit the user to adjust the size of those sections of the read-write memory in accordance with his present problem solving requirements. 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 for displaying data entered into the calculator, the results of computations, and selected alphanumeric messages, and a 16-column alphanumeric thermal printer for printing result…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.