Programmable calculator including program trace means
US4181965A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1977 |
| Grant date | Jan 1, 1980 |
| 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, a central processing unit, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units. The memory, central processing, 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 an alphameric printer unit. The calculator includes a TRACE key that permits the user to manually or programmably obtain an alphameric print-out of the number of each line of alphameric statements executed by the calculator and the value of each numeric assignment made therein. The calculator includes a NORMAL key for permitting the user to manually …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.