Programmable calculator including user-definable keys
US4145742A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1977 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | May 24, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F15/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An adaptable programmable calculator is provided by employing modular read-write and read-only memory units capable of being expanded to provide the calculator with additional program and data storage functions, a central processing unit, and an input-output control unit for bidirectionally transferring information between the memory or central processing units and a number of input and output units. The memory, central processor, and input-output control units are controlled by a microprocessor included in the central processing unit. The input and output units include a keyboard input unit, a magnetic card reading and recording unit, a solid state multi-character display unit capable of displaying every alphabetic and numeric character and many other symbols individually and in a line of one or more alphameric statements, and a thermal printer unit. The keyboard input unit includes a plurality of definable keys by which the user may define and store in the read-write memory unit additional keyboard functions to be performed by the calculator, may associate each such defined keyboard function with a separate definable key of the keyboard, and may cause each such defined keyboard f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.