Programmable calculator employing computed memory addresses
US4159525A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1977 |
| Grant date | Jun 26, 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 a modular read-write and read-only memory unit 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 capable of performing both serial binary and parallel binary-coded-decimal arithmetic, 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, such as a keyboard and an output display unit. The memory, central processor, and input-output control units are controlled by a microprocessor included in the central processing unit. Data storage registers within the calculator memory may be addressed directly by the computed integral value of an arithmetic expression that may in turn incorporate the contents of one or more similarly addressed data storage registers, thus facilitating efficient fetching and storing of information, as well as matrix operations and manipulation of files. A plurality of dedicated data storage registers having fixed labels and locations within the calculator memory ma…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.