Programmable calculator including alphanumeric error display means
US4158228A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1977 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Jun 1, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F15/0233
- 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 oriented towards the environment of the user, a central processing unit, 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 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 an output printer unit capable of printing on thermal sensitive paper every alphabetic and numeric character and many other symbols individually and in alphameric statements or messages. Syntactical errors in a line of one or more alphameric statements being entered into the calculator from the keyboard input unit are automatically d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.